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

[Ulrich Weigand via cfe-commits]

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+; NOTE: Assertions have been autogenerated by utils/update_llc_test_checks.py UTC_ARGS: --version 5
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uweigand wrote:

Here I think it would be good to add one more test, to verify that the *frame pointer* is saved if it is live - this is currently tested nowhere.  To do so, I think it should suffice to call setjmp in a function that required a frame pointer because it does a variable-sized alloca.  (This FP test could be done both with and without mbackchain to test all the permuations.)

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