[clang] [llvm] [SystemZ] Add support for __builtin_setjmp and __builtin_longjmp (PR #116642)

[Paul Kirth via cfe-commits]

ilovepi wrote:

@uweigand Thanks for the prompt revert. 

For reference the Fuchsia bot is just a normal Linux build configured for building Fuchsia in a debian container. The toolchain isn't novel in anyway, except it normally builds with a recent toolchain, and uses the full runtimes build. The bot will list all the CMAKE options we use, and the DockerFile should be with the zorg build bot configs for other buildbots if you have trouble reproducing.

https://github.com/llvm/llvm-project/pull/116642