[clang] [CIR] Call code gen; create empty cir.func op (PR #113483)

[Aaron Ballman via cfe-commits]

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@@ -13,4 +13,22 @@
 #ifndef LLVM_CLANG_CIR_DIALECT_IR_CIRDIALECT_H
 #define LLVM_CLANG_CIR_DIALECT_IR_CIRDIALECT_H
 
+#include "mlir/IR/Builders.h"
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AaronBallman wrote:

I think we'd usually have the clang includes first though so there's less chance of accidental reliance on transitive includes from mlir.

https://github.com/llvm/llvm-project/pull/113483