[llvm] Set shader analysis flags EnableRawAndStructuredBuffers and ComputeShadersPlusRawAndStructuredBuffers for RWBuffers (PR #114449)

[Damyan Pepper via llvm-commits]

================
@@ -36,8 +39,35 @@ static void updateFlags(ComputedShaderFlags &Flags, const Instruction &I) {
   }
 }
 
-ComputedShaderFlags ComputedShaderFlags::computeFlags(Module &M) {
+static void updateResourceFlags(ComputedShaderFlags &Flags, Module &M,
+                                ModuleAnalysisManager *AM) {
+  if (!AM)
+    return;
+
+  const DXILResourceMap &DRM = AM->getResult<DXILResourceAnalysis>(M);
+  if (DRM.empty())
+    return;
+
+  const dxil::ModuleMetadataInfo &MMDI = AM->getResult<DXILMetadataAnalysis>(M);
+  VersionTuple SM = MMDI.ShaderModelVersion;
+  Triple::EnvironmentType SP = MMDI.ShaderProfile;
+
+  // RWBuffer
+  for (const ResourceInfo &RI : DRM.uavs()) {
+    if (RI.getResourceKind() == ResourceKind::TypedBuffer) {
+      Flags.EnableRawAndStructuredBuffers = true;
+      Flags.ComputeShadersPlusRawAndStructuredBuffers =
+          (SP == Triple::EnvironmentType::Compute && SM.getMajor() == 4);
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damyanp wrote:

```SM.getMajor() == 4```

This means SM 4.x?  In which case this flag will never be set.  I'm surprised it isn't `>= 4`.

https://github.com/llvm/llvm-project/pull/114449