[clr-interp] Access checks and callouts

[davidwrighton]

Add support for visibility and access checks, as well as ambiguous function identification

• Utilize the jit interface driven scheme where certain jit interface calls will inform the jit that it should inject a call to a helper function.

As a drive-by feature, add support for DOTNET_InterpBreak which works like DOTNET_JitBreak in that it will cause the interpreter compiler to assert when a function is about to go through the interpreter compiler. This is useful to make it easy to debug the interpreter compiler compiling a specific method.

[Copilot]

Pull Request Overview

This PR adds support for visibility and access checks to the CLR interpreter, along with a debugging feature. The main purpose is to implement security checks during interpretation by utilizing the JIT interface's existing access control mechanisms and injecting helper function calls when access violations are detected.

Key changes:

• Adds two new interpreter opcodes for calling helper functions with 2 and 3 pointer arguments
• Implements access control checks throughout the interpreter compiler for field access, method calls, and class operations
• Adds DOTNET_InterpBreak debug configuration option similar to DOTNET_JitBreak

Reviewed Changes

Copilot reviewed 5 out of 5 changed files in this pull request and generated 2 comments.

Show a summary per file

File	Description
src/coreclr/vm/interpexec.cpp	Adds execution logic for new helper call opcodes with 2 and 3 arguments
src/coreclr/interpreter/interpconfigvalues.h	Adds InterpBreak configuration option for debugging
src/coreclr/interpreter/inc/intops.def	Defines two new opcodes for helper function calls
src/coreclr/interpreter/compiler.h	Declares new method for emitting callsite callout instructions
src/coreclr/interpreter/compiler.cpp	Implements access checks and callout emission throughout compilation

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