[ser] Remove AvailabilityAttribute on HitObject ctor (unused)

Author: simoll

tools/clang/lib/AST/ASTContextHLSL.cpp

@@ -1243,10 +1243,6 @@ CXXRecordDecl *hlsl::DeclareHitObjectType(NamespaceDecl &NSDecl) {
       static_cast<int>(hlsl::IntrinsicOp::MOP_DxHitObject_MakeNop)));
   pConstructorDecl->addAttr(HLSLCXXOverloadAttr::CreateImplicit(Context));
 
-  // Shader Execution Reordering requires SM6.9
-  VersionTuple VT69 = VersionTuple(6, 9);
-  pConstructorDecl->addAttr(ConstructAvailabilityAttribute(Context, VT69));
-
   // Add the implicit HLSLHitObjectAttr attribute to unambiguously recognize the
   // builtin HitObject type (SM6.9+). This distinguishes it from any
   // user-defined type named 'HitObject' pre SM6.9.