[clang] [OpenACC][CIR] Implement 'self' lowering on compute constructs (PR #135851)

[Andy Kaylor via cfe-commits]

================
@@ -32,46 +32,52 @@ constexpr bool isOneOfTypes =
 template <typename ToTest, typename T>
 constexpr bool isOneOfTypes<ToTest, T> = std::is_same_v<ToTest, T>;
 
+template <typename OpTy>
 class OpenACCClauseCIREmitter final
-    : public OpenACCClauseVisitor<OpenACCClauseCIREmitter> {
-  CIRGenModule &cgm;
+    : public OpenACCClauseVisitor<OpenACCClauseCIREmitter<OpTy>> {
+  OpTy &operation;
+  CIRGenFunction &cgf;
+  CIRGenBuilderTy &builder;
+
   // This is necessary since a few of the clauses emit differently based on the
   // directive kind they are attached to.
   OpenACCDirectiveKind dirKind;
+  // This source location should be able to go away once the NYI diagnostics are
----------------
andykaylor wrote:

```suggestion
  // TODO(cir): This source location should be able to go away once the NYI diagnostics are
```
To make it less likely to be permanently overlooked.

https://github.com/llvm/llvm-project/pull/135851