[clang] [llvm] [NFC][HLSL][DirectX] Let `HLSLRootSignature` reuse the `dxbc` defined enums (PR #145986)

[Sarah Spall via cfe-commits]

================
@@ -200,38 +81,38 @@ struct DescriptorTableClause {
   uint32_t NumDescriptors = 1;
   uint32_t Space = 0;
   uint32_t Offset = DescriptorTableOffsetAppend;
-  DescriptorRangeFlags Flags;
+  dxbc::DescriptorRangeFlags Flags;
 
   void setDefaultFlags() {
     switch (Type) {
     case ClauseType::CBuffer:
     case ClauseType::SRV:
-      Flags = DescriptorRangeFlags::DataStaticWhileSetAtExecute;
+      Flags = dxbc::DescriptorRangeFlags::DataStaticWhileSetAtExecute;
       break;
     case ClauseType::UAV:
-      Flags = DescriptorRangeFlags::DataVolatile;
+      Flags = dxbc::DescriptorRangeFlags::DataVolatile;
       break;
     case ClauseType::Sampler:
-      Flags = DescriptorRangeFlags::None;
+      Flags = dxbc::DescriptorRangeFlags::None;
       break;
     }
   }
 };
 
 struct StaticSampler {
   Register Reg;
-  SamplerFilter Filter = SamplerFilter::Anisotropic;
-  TextureAddressMode AddressU = TextureAddressMode::Wrap;
-  TextureAddressMode AddressV = TextureAddressMode::Wrap;
-  TextureAddressMode AddressW = TextureAddressMode::Wrap;
+  dxbc::SamplerFilter Filter = dxbc::SamplerFilter::Anisotropic;
+  dxbc::TextureAddressMode AddressU = dxbc::TextureAddressMode::Wrap;
+  dxbc::TextureAddressMode AddressV = dxbc::TextureAddressMode::Wrap;
+  dxbc::TextureAddressMode AddressW = dxbc::TextureAddressMode::Wrap;
   float MipLODBias = 0.f;
   uint32_t MaxAnisotropy = 16;
-  ComparisonFunc CompFunc = ComparisonFunc::LessEqual;
-  StaticBorderColor BorderColor = StaticBorderColor::OpaqueWhite;
+  llvm::dxbc::ComparisonFunc CompFunc = llvm::dxbc::ComparisonFunc::LessEqual;
+  dxbc::StaticBorderColor BorderColor = dxbc::StaticBorderColor::OpaqueWhite;
----------------
spall wrote:

is there a distinction between llvm::dxcbc and dxbc? I noticed a few other 
places where you used both right by eachother. 

https://github.com/llvm/llvm-project/pull/145986
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