[libc-commits] [libc] [libc][setjmp] fix setjmp test (PR #87837)

[Eli Friedman via libc-commits]

efriedma-quic wrote:

> As long as llvm-project requires the usage of cmake, we have tight controls of the compiler flags. Downstreams that don't use cmake will need to match compiler flags when certain TUs use specific compiler flags in controlled and well understood ways to control code gen. Having code be correct under any possible combination of compiler flags is something we will not support.

This is true to some extent, but depending on the exact form of the function prologue is excessively fragile.

https://github.com/llvm/llvm-project/pull/87837