llvm-project

15141233 - [CIR] Skip trivially-recursive available_externally function bodies (#198363)

[CIR] Skip trivially-recursive available_externally function bodies (#198363) CIR was emitting available_externally bodies for glibc-style inline wrappers whose sole call is back to the same asm-named symbol (via __builtin_*). LLVM then treats the function as non-terminating and can fold away surrounding null checks — the same failure mode as classic CodeGen PR9614 (basename-style if (cwd) paths). Port isTriviallyRecursive / shouldEmitFunction from CodeGenModule, including the isInlineBuiltinDeclaration exemption, and skip emitting those definitions. isTriviallyRecursive (and its FunctionIsDirectlyRecursive visitor) lives on MangleContext, so both classic CodeGen and CIRGen call getMangleContext().isTriviallyRecursive(FD).