Richard Smith 1c604a9f5f Recognize setjmp and friends as builtins even if jmp_buf is not declared yet. ...

This happens in glibc's headers. It's important that we recognize these
functions so that we can mark them as returns_twice.

Differential Revision: https://reviews.llvm.org/D88518

2020-09-29 15:53:17 -07:00

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