Resolve ILLink warnings in Microsoft.VisualBasic.Core (#51725)

* Addressing most of the Linker Warnings in Microsoft.VB

* Address COM Linker warnings

* Address remaining warnings

* Update Reference assembly

* Provide better RequiresUnreferencedCode comments

* Fix build

* Address some feedback

* More Feedback

src/libraries/Microsoft.VisualBasic.Core/src/MatchingRefApiCompatBaseline.txt

@@ -1,28 +1,4 @@
-Compat issues with assembly Microsoft.VisualBasic:
-
-# Loaded via reflection so needs to be public in the implementation but we don't want to expose them publicly in the ref assembly:
-MembersMustExist : Member 'Microsoft.VisualBasic.CompilerServices.Conversions.FallbackUserDefinedConversion(System.Object, System.Type)' does not exist in the reference but it does exist in the implementation.
-MembersMustExist : Member 'Microsoft.VisualBasic.CompilerServices.NewLateBinding.FallbackCall(System.Object, System.String, System.Object[], System.String[], System.Boolean)' does not exist in the reference but it does exist in the implementation.
-MembersMustExist : Member 'Microsoft.VisualBasic.CompilerServices.NewLateBinding.FallbackGet(System.Object, System.String, System.Object[], System.String[])' does not exist in the reference but it does exist in the implementation.
-MembersMustExist : Member 'Microsoft.VisualBasic.CompilerServices.NewLateBinding.FallbackIndexSet(System.Object, System.Object[], System.String[])' does not exist in the reference but it does exist in the implementation.
-MembersMustExist : Member 'Microsoft.VisualBasic.CompilerServices.NewLateBinding.FallbackIndexSetComplex(System.Object, System.Object[], System.String[], System.Boolean, System.Boolean)' does not exist in the reference but it does exist in the implementation.
-MembersMustExist : Member 'Microsoft.VisualBasic.CompilerServices.NewLateBinding.FallbackInvokeDefault1(System.Object, System.Object[], System.String[], System.Boolean)' does not exist in the reference but it does exist in the implementation.
-MembersMustExist : Member 'Microsoft.VisualBasic.CompilerServices.NewLateBinding.FallbackInvokeDefault2(System.Object, System.Object[], System.String[], System.Boolean)' does not exist in the reference but it does exist in the implementation.
-MembersMustExist : Member 'Microsoft.VisualBasic.CompilerServices.NewLateBinding.FallbackSet(System.Object, System.String, System.Object[])' does not exist in the reference but it does exist in the implementation.
-MembersMustExist : Member 'Microsoft.VisualBasic.CompilerServices.NewLateBinding.FallbackSetComplex(System.Object, System.String, System.Object[], System.Boolean, System.Boolean)' does not exist in the reference but it does exist in the implementation.
-MembersMustExist : Member 'Microsoft.VisualBasic.CompilerServices.NewLateBinding.LateCallInvokeDefault(System.Object, System.Object[], System.String[], System.Boolean)' does not exist in the reference but it does exist in the implementation.
-MembersMustExist : Member 'Microsoft.VisualBasic.CompilerServices.NewLateBinding.LateGetInvokeDefault(System.Object, System.Object[], System.String[], System.Boolean)' does not exist in the reference but it does exist in the implementation.
-MembersMustExist : Member 'Microsoft.VisualBasic.CompilerServices.Operators.FallbackInvokeUserDefinedOperator(System.Object, System.Object[])' does not exist in the reference but it does exist in the implementation.
-TypesMustExist : Type 'Microsoft.VisualBasic.CompilerServices.SiteDelegate0' does not exist in the reference but it does exist in the implementation.
-TypesMustExist : Type 'Microsoft.VisualBasic.CompilerServices.SiteDelegate1' does not exist in the reference but it does exist in the implementation.
-TypesMustExist : Type 'Microsoft.VisualBasic.CompilerServices.SiteDelegate2' does not exist in the reference but it does exist in the implementation.
-TypesMustExist : Type 'Microsoft.VisualBasic.CompilerServices.SiteDelegate3' does not exist in the reference but it does exist in the implementation.
-TypesMustExist : Type 'Microsoft.VisualBasic.CompilerServices.SiteDelegate4' does not exist in the reference but it does exist in the implementation.
-TypesMustExist : Type 'Microsoft.VisualBasic.CompilerServices.SiteDelegate5' does not exist in the reference but it does exist in the implementation.
-TypesMustExist : Type 'Microsoft.VisualBasic.CompilerServices.SiteDelegate6' does not exist in the reference but it does exist in the implementation.
-TypesMustExist : Type 'Microsoft.VisualBasic.CompilerServices.SiteDelegate7' does not exist in the reference but it does exist in the implementation.
-
-# C# doesn't permit setting the parameter name of the setter.
+Compat issues with assembly Microsoft.VisualBasic.Core:
 ParameterNamesCannotChange : Parameter name on member 'Microsoft.VisualBasic.ComClassAttribute.InterfaceShadows.set(System.Boolean)' is 'value' in the reference but 'AutoPropertyValue' in the implementation.
 ParameterNamesCannotChange : Parameter name on member 'Microsoft.VisualBasic.DateAndTime.DateString.set(System.String)' is 'value' in the reference but 'Value' in the implementation.
 ParameterNamesCannotChange : Parameter name on member 'Microsoft.VisualBasic.DateAndTime.TimeOfDay.set(System.DateTime)' is 'value' in the reference but 'Value' in the implementation.
@@ -33,3 +9,4 @@ ParameterNamesCannotChange : Parameter name on member 'Microsoft.VisualBasic.Err
 ParameterNamesCannotChange : Parameter name on member 'Microsoft.VisualBasic.ErrObject.HelpFile.set(System.String)' is 'value' in the reference but 'Value' in the implementation.
 ParameterNamesCannotChange : Parameter name on member 'Microsoft.VisualBasic.ErrObject.Number.set(System.Int32)' is 'value' in the reference but 'Value' in the implementation.
 ParameterNamesCannotChange : Parameter name on member 'Microsoft.VisualBasic.ErrObject.Source.set(System.String)' is 'value' in the reference but 'Value' in the implementation.
+Total Issues: 10

src/libraries/Microsoft.VisualBasic.Core/src/Microsoft/VisualBasic/CompilerServices/ConversionResolution.vb

@@ -8,6 +8,7 @@ Imports System.Collections.Generic
 
 Imports Microsoft.VisualBasic.CompilerServices.Symbols
 Imports Microsoft.VisualBasic.CompilerServices.ConversionResolution.OperatorCaches
+Imports System.Diagnostics.CodeAnalysis
 
 Namespace Microsoft.VisualBasic.CompilerServices
 
@@ -120,6 +121,8 @@ Namespace Microsoft.VisualBasic.CompilerServices
 
 #If DEBUG Then
         <System.Diagnostics.ConditionalAttribute("DEBUG")>
+        <UnconditionalSuppressMessage("ReflectionAnalysis", "IL2026:RequiresUnreferencedCode",
+            Justification:="This method only gets called in DEBUG mode.")>
         Private Shared Sub VerifyForLoopWidestType()
             Const Max As Integer = TypeCode.String
 
@@ -173,6 +176,7 @@ Namespace Microsoft.VisualBasic.CompilerServices
             Debug.Assert(TypeCode.String = 18, "wrong value!")
         End Sub
 
+        <RequiresUnreferencedCode("Calls ClassifyUserDefinedConversion")>
         Friend Shared Function ClassifyConversion(ByVal targetType As System.Type, ByVal sourceType As System.Type, ByRef operatorMethod As Method) As ConversionClass
             'This function classifies the nature of the conversion from the source type to the target
             'type. If such a conversion requires a user-defined conversion, it will be supplied as an
@@ -514,6 +518,7 @@ Namespace Microsoft.VisualBasic.CompilerServices
 
         End Function
 
+        <RequiresUnreferencedCode("Calls Operators.CollectOperators")>
         Private Shared Function CollectConversionOperators(
             ByVal targetType As System.Type,
             ByVal sourceType As System.Type,
@@ -855,6 +860,7 @@ Namespace Microsoft.VisualBasic.CompilerServices
 
         End Function
 
+        <RequiresUnreferencedCode("Calls DoClassifyUserDefinedConversion")>
         Friend Shared Function ClassifyUserDefinedConversion(
             ByVal targetType As System.Type,
             ByVal sourceType As System.Type,
@@ -909,6 +915,7 @@ Namespace Microsoft.VisualBasic.CompilerServices
             Return result
         End Function
 
+        <RequiresUnreferencedCode("Calls CollectConversionOperators")>
         Private Shared Function DoClassifyUserDefinedConversion(
             ByVal targetType As System.Type,
             ByVal sourceType As System.Type,