Fail with clear error message when reporting file accesses with unsupported arch (#9241)

Follow-up change from #9214.

Author: dfederm

src/Build/BackEnd/BuildManager/BuildManager.cs

@@ -728,6 +728,9 @@ void InitializeCaches()
         [MethodImpl(MethodImplOptions.NoInlining)]
         private void EnableDetouredNodeLauncher()
         {
+            // Currently BuildXL only supports x64. Once this feature moves out of the experimental phase, this will need to be addressed.
+            ErrorUtilities.VerifyThrowInvalidOperation(NativeMethodsShared.ProcessorArchitecture == NativeMethodsShared.ProcessorArchitectures.X64, "ReportFileAccessesX64Only");
+
             // To properly report file access, we need to disable the in-proc node which won't be detoured.
             _buildParameters.DisableInProcNode = true;
 

src/Build/Resources/Strings.resx

@@ -1998,6 +1998,9 @@ Utilization:          {0} Average Utilization: {1:###.0}</value>
     <value>MSB4277: Cannot copy from object of that type.</value>
     <comment>{StrBegin="MSB4277: "}</comment>
   </data>
+  <data name="ReportFileAccessesX64Only" xml:space="preserve">
+    <value>Reporting file accesses is only currently supported using the x64 flavor of MSBuild.</value>
+  </data>
   <!--
         The Build message bucket is: MSB4000 - MSB4999