[llvm] [DirectX] Remove custom error classes from RootSignature Metadata parser (PR #161921)

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``````````bash
git-clang-format --diff origin/main HEAD --extensions cpp,h -- llvm/include/llvm/Frontend/HLSL/RootSignatureMetadata.h llvm/lib/Frontend/HLSL/RootSignatureMetadata.cpp
``````````

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View the diff from clang-format here.
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``````````diff
diff --git a/llvm/lib/Frontend/HLSL/RootSignatureMetadata.cpp b/llvm/lib/Frontend/HLSL/RootSignatureMetadata.cpp
index 73d91a47c..3bf2b8113 100644
--- a/llvm/lib/Frontend/HLSL/RootSignatureMetadata.cpp
+++ b/llvm/lib/Frontend/HLSL/RootSignatureMetadata.cpp
@@ -823,10 +823,10 @@ Error MetadataParser::validateRootSignature(
                                               Sampler.ShaderRegister));
 
     if (!hlsl::rootsig::verifyRegisterSpace(Sampler.RegisterSpace))
-      DeferredErrs =
-          joinErrors(std::move(DeferredErrs),
-                     createRSError(RSErrorKind::Validation, StringRef(
-                         "RegisterSpace"), Sampler.RegisterSpace));
+      DeferredErrs = joinErrors(std::move(DeferredErrs),
+                                createRSError(RSErrorKind::Validation,
+                                              StringRef("RegisterSpace"),
+                                              Sampler.RegisterSpace));
     bool IsValidFlag =
         dxbc::isValidStaticSamplerFlags(Sampler.Flags) &&
         hlsl::rootsig::verifyStaticSamplerFlags(

``````````

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https://github.com/llvm/llvm-project/pull/161921