[CIR] Handle __asm labels on function declarations (#168149) This updates the CIR direct callee builder code to handle the case of calls to functions that were declared with an assembly label using `__asm`. The implementation doesn't actually have any explicit handling of the AsmLabelAttr. It is handled by the name mangler. See https://reviews.llvm.org/D137073 and https://reviews.llvm.org/D134362 for details on how this was implemented in classic codegen. The test here is copied from https://reviews.llvm.org/D134362 because the test in https://reviews.llvm.org/D134362 requires a target that isn't yet supported in CIR.
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