[llvm] [DirectX] Infrastructure to collect shader flags for each function (PR #112967)

[S. Bharadwaj Yadavalli via llvm-commits]

================
@@ -60,21 +62,54 @@ struct ComputedShaderFlags {
     return FeatureFlags;
   }
 
-  static ComputedShaderFlags computeFlags(Module &M);
+  uint64_t getModuleFlags() const {
+    uint64_t ModuleFlags = 0;
+#define DXIL_MODULE_FLAG(DxilModuleBit, FlagName, Str)                         \
+  ModuleFlags |= FlagName ? getMask(DxilModuleBit) : 0ull;
+#include "llvm/BinaryFormat/DXContainerConstants.def"
+    return ModuleFlags;
+  }
+
+  void merge(const uint64_t IVal) {
+#define SHADER_FEATURE_FLAG(FeatureBit, DxilModuleBit, FlagName, Str)          \
+  FlagName |= (IVal & getMask(DxilModuleBit));
+#define DXIL_MODULE_FLAG(DxilModuleBit, FlagName, Str)                         \
+  FlagName |= (IVal & getMask(DxilModuleBit));
+#include "llvm/BinaryFormat/DXContainerConstants.def"
+    return;
+  }
+
   void print(raw_ostream &OS = dbgs()) const;
   LLVM_DUMP_METHOD void dump() const { print(); }
 };
 
+struct DXILModuleShaderFlagsInfo {
----------------
bharadwajy wrote:

> nit: This class's full name is `llvm::dxil::DXILModuleShaderFlagsInfo`, that's a bit of a mouthful. I'm not really sure how much benefit we get from prefixing it with DXIL and suffixing it with Info.

Changed to `ModuleShaderFlags`

https://github.com/llvm/llvm-project/pull/112967