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

[Ulrich Weigand via llvm-commits]

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+; Test for Frame Pointer in first slot in jmp_buf.
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uweigand wrote:

Similar question here.  This is a very long test, and only a couple of instructions are tested via CHECK statements.  Whatever we want to test here should be done in a much more streamlined test case.

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