[clang] [llvm] [SystemZ, Clang] Enable verification of int args extensions by default. (PR #223755)

[Nikita Popov via llvm-commits]

nikic wrote:

Limiting to C calling convention is fine, but that does not replace the isInternal() check. For local-linkage functions the ABI is arbitrary, no matter what the specified CC is.

https://github.com/llvm/llvm-project/pull/223755