[clang] [OpenACC][CIR] 'cache' construct lowering (PR #146915)

[Erich Keane via cfe-commits]

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@@ -1204,7 +1204,41 @@ class CIRGenFunction : public CIRGenTypeCache {
   void updateLoopOpParallelism(mlir::acc::LoopOp &op, bool isOrphan,
                                OpenACCDirectiveKind dk);
 
+  // The OpenACC 'cache' construct actually applies to the 'loop' if present. So
+  // keep track of the 'loop' so that we can add the cache vars to it correctly.
+  mlir::acc::LoopOp *activeLoopOp = nullptr;
+
+  struct ActiveLoopRAII {
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erichkeane wrote:

> Since the loop op is an ACC specific one , should this be renamed `ActiveACCLoopRAII` or similar?

Yeah, agreed, I'll make that change.  Thanks!

https://github.com/llvm/llvm-project/pull/146915