[clang] [llvm] [HLSL] Add `Increment`/`DecrementCounter` methods to structured buffers (PR #114148)

[Tex Riddell via cfe-commits]

================
@@ -2161,6 +2186,22 @@ bool SemaHLSL::CheckBuiltinFunctionCall(unsigned 
BuiltinID, CallExpr *TheCall) {
       return true;
     break;
   }
+  case Builtin::BI__builtin_hlsl_buffer_update_counter: {
+    if (SemaRef.checkArgCount(TheCall, 2) ||
+        CheckResourceHandle(&SemaRef, TheCall, 0) ||
+        CheckInt(&SemaRef, TheCall, 1))
+      return true;
+    Expr *OffsetExpr = TheCall->getArg(1);
+    std::optional<llvm::APSInt> Offset =
+        OffsetExpr->getIntegerConstantExpr(SemaRef.getASTContext());
+    if (!Offset.has_value() || abs(Offset->getExtValue()) != 1) {
+      SemaRef.Diag(TheCall->getArg(1)->getBeginLoc(),
----------------
tex3d wrote:

```suggestion
      SemaRef.Diag(TheCall->getArg(1)->getExprLoc(),
```

https://github.com/llvm/llvm-project/pull/114148
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