[llvm] [DirectX][NFC] Refactoring DirectX backend to not use `llvm::to_underlying` in switch cases. (PR #151032)

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``````````bash
git-clang-format --diff HEAD~1 HEAD --extensions cpp -- llvm/lib/Frontend/HLSL/HLSLRootSignature.cpp llvm/lib/Frontend/HLSL/RootSignatureMetadata.cpp llvm/lib/Frontend/HLSL/RootSignatureValidations.cpp llvm/lib/MC/DXContainerRootSignature.cpp llvm/lib/ObjectYAML/DXContainerEmitter.cpp llvm/lib/ObjectYAML/DXContainerYAML.cpp llvm/lib/Target/DirectX/DXILRootSignature.cpp
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View the diff from clang-format here.
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diff --git a/llvm/lib/Frontend/HLSL/HLSLRootSignature.cpp b/llvm/lib/Frontend/HLSL/HLSLRootSignature.cpp
index 91152673d..5a5401a41 100644
--- a/llvm/lib/Frontend/HLSL/HLSLRootSignature.cpp
+++ b/llvm/lib/Frontend/HLSL/HLSLRootSignature.cpp
@@ -93,8 +93,7 @@ static raw_ostream &operator<<(raw_ostream &OS,
 }
 
 static raw_ostream &operator<<(raw_ostream &OS, const ClauseType &Type) {
-  OS << enumToStringRef(dxil::ResourceClass(Type),
-                        dxil::getResourceClasses());
+  OS << enumToStringRef(dxil::ResourceClass(Type), dxil::getResourceClasses());
 
   return OS;
 }
diff --git a/llvm/lib/Frontend/HLSL/RootSignatureMetadata.cpp b/llvm/lib/Frontend/HLSL/RootSignatureMetadata.cpp
index c663c1db0..8cb2c92d1 100644
--- a/llvm/lib/Frontend/HLSL/RootSignatureMetadata.cpp
+++ b/llvm/lib/Frontend/HLSL/RootSignatureMetadata.cpp
@@ -120,9 +120,8 @@ MDNode *MetadataBuilder::BuildRootConstants(const RootConstants &Constants) {
 
 MDNode *MetadataBuilder::BuildRootDescriptor(const RootDescriptor &Descriptor) {
   IRBuilder<> Builder(Ctx);
-  StringRef ResName =
-      enumToStringRef(dxil::ResourceClass(Descriptor.Type),
-                      dxil::getResourceClasses());
+  StringRef ResName = enumToStringRef(dxil::ResourceClass(Descriptor.Type),
+                                      dxil::getResourceClasses());
   assert(!ResName.empty() && "Provided an invalid Resource Class");
   SmallString<7> Name({"Root", ResName});
   Metadata *Operands[] = {
@@ -162,9 +161,8 @@ MDNode *MetadataBuilder::BuildDescriptorTable(const DescriptorTable &Table) {
 MDNode *MetadataBuilder::BuildDescriptorTableClause(
     const DescriptorTableClause &Clause) {
   IRBuilder<> Builder(Ctx);
-  StringRef ResName =
-      enumToStringRef(dxil::ResourceClass(Clause.Type),
-                      dxil::getResourceClasses());
+  StringRef ResName = enumToStringRef(dxil::ResourceClass(Clause.Type),
+                                      dxil::getResourceClasses());
   assert(!ResName.empty() && "Provided an invalid Resource Class");
   Metadata *Operands[] = {
       MDString::get(Ctx, ResName),

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https://github.com/llvm/llvm-project/pull/151032