Merge needed march release followups into mesh nodes (#6786)

Merges the following changes into mesh nodes to fix a known bug that
required a point release in the march release branch and also some build
fixes for new visual studio diagnostics.

9ca52f4 Add duplicate pragma (#6732)
7809c0b Remove Windows C++ redist hack (#6692)
33277a1 Workaround broken GitHub runner images (#6683)
1b9a796 [Sema] Check FunctionDecl has identifier before getName.
(#6439) (#6457)

Author: Greg Roth

projects/dxilconv/include/ShaderBinary/ShaderBinary.h

@@ -378,6 +378,8 @@ class COperandBase {
     INT64 m_Value64[2];
     double m_Valued[2];
   };
+
+#pragma warning(suppress : 4201) // Warning about nameless structure.
   struct {
     D3D10_SB_OPERAND_INDEX_REPRESENTATION m_IndexType[3];
     D3D10_SB_OPERAND_INDEX_DIMENSION m_IndexDimension;

tools/clang/lib/Sema/SemaHLSL.cpp

@@ -15823,7 +15823,8 @@ void TryAddShaderAttrFromTargetProfile(Sema &S, FunctionDecl *FD,
 
   // if this FD isn't the entry point, then we shouldn't add
   // a shader attribute to this decl, so just return
-  if (EntryPointName != FD->getIdentifier()->getName()) {
+  if (!FD->getIdentifier() ||
+      EntryPointName != FD->getIdentifier()->getName()) {
     return;
   }
 

tools/clang/test/SemaHLSL/operator-overload.hlsl

@@ -0,0 +1,32 @@
+// RUN: %dxc -Tps_6_0 -verify %s
+
+// expected-error@+1 {{overloading non-member 'operator==' is not allowed}}
+bool operator==(int lhs, int rhs) {
+    return true;
+}
+
+struct A {
+  float a;
+  int b;
+};
+
+// expected-error@+1 {{overloading non-member 'operator>' is not allowed}}
+bool operator>(A a0, A a1) {
+  return a1.a > a0.a && a1.b > a0.b;
+}
+// expected-error@+1 {{overloading non-member 'operator==' is not allowed}}
+bool operator==(A a0, int i) {
+    return a0.b == i;
+}
+// expected-error@+1 {{overloading non-member 'operator<' is not allowed}}
+bool operator<(A a0, float f) {
+   return a0.a < f;
+}
+// expected-error@+1 {{overloading 'operator++' is not allowed}}
+A operator++(A a0) {
+  a0.a++;
+  a0.b++;
+  return a0;
+}
+
+void main() {}