[clang] [OpenACC][CIR] Implement member exprs for 'copy' lowering (PR #142998)

[Valentin Clement バレンタイン クレメン via cfe-commits]

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@@ -226,6 +228,10 @@ class OpenACCClauseCIREmitter final
     mlir::Location exprLoc = cgf.cgm.getLoc(curVarExpr->getBeginLoc());
     llvm::SmallVector<mlir::Value> bounds;
 
+    std::string exprString;
+    llvm::raw_string_ostream OS(exprString);
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clementval wrote:

Maybe? 
```suggestion
    llvm::raw_string_ostream os(exprString);
```

https://github.com/llvm/llvm-project/pull/142998