[llvm] [HLSL] Diagnose overlapping resource bindings (PR #140982)

[Justin Bogner via llvm-commits]

================
@@ -50,15 +51,55 @@ static void reportInvalidDirection(Module &M, DXILResourceMap &DRM) {
   }
 }
 
-} // namespace
+static void reportOverlappingError(Module &M, ResourceInfo R1,
+                                   ResourceInfo R2) {
+  SmallString<64> Message;
+  raw_svector_ostream OS(Message);
+  OS << "resource " << R1.getName() << " at register "
+     << R1.getBinding().LowerBound << " overlaps with resource " << R2.getName()
+     << " at register " << R2.getBinding().LowerBound << ", space "
+     << R2.getBinding().Space;
+  M.getContext().diagnose(DiagnosticInfoGeneric(Message));
+}
 
-PreservedAnalyses
-DXILPostOptimizationValidation::run(Module &M, ModuleAnalysisManager &MAM) {
-  DXILResourceMap &DRM = MAM.getResult<DXILResourceAnalysis>(M);
+static void reportOverlappingBinding(Module &M, DXILResourceMap &DRM) {
+  if (DRM.empty())
+    return;
 
+  for (auto ResList :
+       {DRM.srvs(), DRM.uavs(), DRM.cbuffers(), DRM.samplers()}) {
----------------
bogner wrote:

`iterator_range` should be cheap to copy so it probably doesn't matter much, but we might as well iterate const refs here.
```suggestion
  for (const auto &ResList :
       {DRM.srvs(), DRM.uavs(), DRM.cbuffers(), DRM.samplers()}) {
```

https://github.com/llvm/llvm-project/pull/140982