[clang] [CIR] Implement lowering for const-emitted global compound literals (PR #201152)

[Andy Kaylor via cfe-commits]

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@@ -447,6 +447,19 @@ class CIRGenModule : public CIRGenTypeCache {
   llvm::DenseMap<mlir::Attribute, cir::GlobalOp> constantStringMap;
   llvm::DenseMap<const UnnamedGlobalConstantDecl *, cir::GlobalOp>
       unnamedGlobalConstantDeclMap;
+  llvm::DenseMap<const CompoundLiteralExpr *, cir::GlobalOp>
+      emittedCompoundLiterals;
+
+  cir::GlobalOp
+  getAddrOfConstantCompoundLiteralIfEmitted(const CompoundLiteralExpr *e) {
+    return emittedCompoundLiterals.lookup(e);
+  }
+  void setAddrOfConstantCompoundLiteral(const CompoundLiteralExpr *e,
+                                        cir::GlobalOp gv) {
+    bool ok = emittedCompoundLiterals.insert({e, gv}).second;
+    (void)ok;
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andykaylor wrote:

```suggestion
    [[maybe_unused]] bool ok = emittedCompoundLiterals.insert({e, gv}).second;
```

https://github.com/llvm/llvm-project/pull/201152