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

[Aaron Ballman via cfe-commits]

================
@@ -53,6 +53,7 @@ class CIRGenerator : public clang::ASTConsumer {
   ~CIRGenerator() override;
   void Initialize(clang::ASTContext &astCtx) override;
   bool HandleTopLevelDecl(clang::DeclGroupRef group) override;
+  mlir::ModuleOp getModule();
----------------
AaronBallman wrote:

Is there a reason this isn't a `const` member function?

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