[clang] [CIR] Add framework for CIR to LLVM IR lowering (PR #124650)

[Bruno Cardoso Lopes via cfe-commits]

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@@ -55,6 +55,9 @@ class CIRGenerator : public clang::ASTConsumer {
   void Initialize(clang::ASTContext &astContext) override;
   bool HandleTopLevelDecl(clang::DeclGroupRef group) override;
   mlir::ModuleOp getModule() const;
+  std::unique_ptr<mlir::MLIRContext> takeContext() {
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bcardosolopes wrote:

I thinks dates back to early prototypes for CIR and clang-tidy integration, but seems like the final version doesn't need it either, see  `clang-tools-extra/clang-tidy/cir/Lifetime.cpp`. Should be fine to get rid of it.

https://github.com/llvm/llvm-project/pull/124650