[llvm] [HLSLSemanticSignatures] Implement the stacked packing of elements (PR #218060)

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``````````bash
git-clang-format --diff origin/main HEAD --extensions cpp,h -- llvm/include/llvm/Frontend/HLSL/SemanticSignaturePacking.h llvm/lib/Frontend/HLSL/SemanticSignaturePacking.cpp llvm/unittests/Frontend/HLSLSemanticSignaturePackingTest.cpp llvm/lib/Frontend/HLSL/SemanticSignatures.cpp --diff_from_common_commit
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``````````diff
diff --git a/llvm/include/llvm/Frontend/HLSL/SemanticSignaturePacking.h b/llvm/include/llvm/Frontend/HLSL/SemanticSignaturePacking.h
index 522b8b76a..bcdb6ec71 100644
--- a/llvm/include/llvm/Frontend/HLSL/SemanticSignaturePacking.h
+++ b/llvm/include/llvm/Frontend/HLSL/SemanticSignaturePacking.h
@@ -25,8 +25,7 @@ static constexpr unsigned MaxSignatureRows = 32;
 static constexpr unsigned MaxSignatureCols = 4;
 
 /// Denotes the element that could not be packed and why.
-class LLVM_ABI SignaturePackingError
-    : public ErrorInfo<SignaturePackingError> {
+class LLVM_ABI SignaturePackingError : public ErrorInfo<SignaturePackingError> {
 public:
   enum ErrorKind {
     SignatureOverflow,

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https://github.com/llvm/llvm-project/pull/218060