[NFC][HLSL][DirectX] Consolidate ResourceClassNames

During the split of the various `Frontend/HLSL` libraries, there was an
oversight to duplicate the `ResourceClassNames` definitions. This commit
simply consolidates the definitions into `DXContainer.h` as
`getResourceClasses`

Author: inbelic

llvm/include/llvm/BinaryFormat/DXContainer.h

@@ -16,6 +16,7 @@
 #include "llvm/ADT/BitmaskEnum.h"
 #include "llvm/ADT/StringRef.h"
 #include "llvm/Support/Compiler.h"
+#include "llvm/Support/DXILABI.h"
 #include "llvm/Support/Error.h"
 #include "llvm/Support/SwapByteOrder.h"
 #include "llvm/TargetParser/Triple.h"
@@ -157,6 +158,8 @@ enum class FeatureFlags : uint64_t {
 static_assert((uint64_t)FeatureFlags::NextUnusedBit <= 1ull << 63,
               "Shader flag bits exceed enum size.");
 
+LLVM_ABI ArrayRef<EnumEntry<llvm::dxil::ResourceClass>> getResourceClasses();
+
 #define ROOT_SIGNATURE_FLAG(Num, Val) Val = Num,
 enum class RootFlags : uint32_t {
 #include "DXContainerConstants.def"

llvm/lib/BinaryFormat/DXContainer.cpp

@@ -60,6 +60,17 @@ ArrayRef<EnumEntry<SigComponentType>> dxbc::getSigComponentTypes() {
   return ArrayRef(SigComponentTypes);
 }
 
+static const EnumEntry<dxil::ResourceClass> ResourceClassNames[] = {
+    {"SRV", llvm::dxil::ResourceClass::SRV},
+    {"UAV", llvm::dxil::ResourceClass::UAV},
+    {"CBV", llvm::dxil::ResourceClass::CBuffer},
+    {"Sampler", llvm::dxil::ResourceClass::Sampler},
+};
+
+ArrayRef<EnumEntry<llvm::dxil::ResourceClass>> dxbc::getResourceClasses() {
+  return ArrayRef(ResourceClassNames);
+}
+
 static const EnumEntry<RootFlags> RootFlagNames[] = {
 #define ROOT_SIGNATURE_FLAG(Val, Enum) {#Enum, RootFlags::Enum},
 #include "llvm/BinaryFormat/DXContainerConstants.def"

llvm/lib/Frontend/HLSL/HLSLRootSignature.cpp

@@ -92,16 +92,9 @@ static raw_ostream &operator<<(raw_ostream &OS,
   return OS;
 }
 
-static const EnumEntry<dxil::ResourceClass> ResourceClassNames[] = {
-    {"CBV", dxil::ResourceClass::CBuffer},
-    {"SRV", dxil::ResourceClass::SRV},
-    {"UAV", dxil::ResourceClass::UAV},
-    {"Sampler", dxil::ResourceClass::Sampler},
-};
-
 static raw_ostream &operator<<(raw_ostream &OS, const ClauseType &Type) {
   OS << enumToStringRef(dxil::ResourceClass(llvm::to_underlying(Type)),
-                        ArrayRef(ResourceClassNames));
+                        dxbc::getResourceClasses());
 
   return OS;
 }

llvm/lib/Frontend/HLSL/RootSignatureMetadata.cpp

@@ -51,13 +51,6 @@ static std::optional<StringRef> extractMdStringValue(MDNode *Node,
   return NodeText->getString();
 }
 
-static const EnumEntry<dxil::ResourceClass> ResourceClassNames[] = {
-    {"CBV", dxil::ResourceClass::CBuffer},
-    {"SRV", dxil::ResourceClass::SRV},
-    {"UAV", dxil::ResourceClass::UAV},
-    {"Sampler", dxil::ResourceClass::Sampler},
-};
-
 namespace {
 
 // We use the OverloadVisit with std::visit to ensure the compiler catches if a
@@ -128,7 +121,7 @@ MDNode *MetadataBuilder::BuildRootDescriptor(const RootDescriptor &Descriptor) {
   IRBuilder<> Builder(Ctx);
   StringRef ResName =
       enumToStringRef(dxil::ResourceClass(to_underlying(Descriptor.Type)),
-                      ArrayRef(ResourceClassNames));
+                      dxbc::getResourceClasses());
   assert(!ResName.empty() && "Provided an invalid Resource Class");
   SmallString<7> Name({"Root", ResName});
   Metadata *Operands[] = {
@@ -170,7 +163,7 @@ MDNode *MetadataBuilder::BuildDescriptorTableClause(
   IRBuilder<> Builder(Ctx);
   StringRef ResName =
       enumToStringRef(dxil::ResourceClass(to_underlying(Clause.Type)),
-                      ArrayRef(ResourceClassNames));
+                      dxbc::getResourceClasses());
   assert(!ResName.empty() && "Provided an invalid Resource Class");
   Metadata *Operands[] = {
       MDString::get(Ctx, ResName),