Implement support for groupshared arg attribute

[spall]

Implements support for groupshared argument attribute.
Closes #7969

[github-actions]

⚠️ C/C++ code formatter, clang-format found issues in your code. ⚠️

You can test this locally with the following command:

git-clang-format --diff 60a1c8568b405bbe9f47ab0431f627ef64988cc4 fdca3fc4d90e4fabe4425082cadacba53ea38a05 -- lib/HLSL/HLLegalizeParameter.cpp tools/clang/include/clang/AST/Decl.h tools/clang/lib/AST/HlslTypes.cpp tools/clang/lib/AST/MicrosoftMangle.cpp tools/clang/lib/CodeGen/CGHLSLMS.cpp tools/clang/lib/Sema/SemaDeclAttr.cpp tools/clang/lib/Sema/SemaHLSL.cpp tools/clang/lib/Sema/SemaOverload.cpp

View the diff from clang-format here.

diff --git a/tools/clang/lib/Sema/SemaHLSL.cpp b/tools/clang/lib/Sema/SemaHLSL.cpp
index bb00635c..a7aa5b59 100644
--- a/tools/clang/lib/Sema/SemaHLSL.cpp
+++ b/tools/clang/lib/Sema/SemaHLSL.cpp
@@ -14485,7 +14485,9 @@ void Sema::DiagnoseHLSLDeclAttr(const Decl *D, const Attr *A) {
           switch (A->getKind()) {
           case clang::attr::HLSLGroupShared: { // todo improve this error msg
             Diag(A->getLocation(), diag::err_hlsl_varmodifiersna)
-                << "groupshared" << "export/noinline" << "parameter";
+                << "groupshared"
+                << "export/noinline"
+                << "parameter";
             return;
             break;
           }

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