[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_cc_test_checks.py UTC_ARGS: --version 5
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uweigand wrote:

I don't think we need a -backchain version of the test case here - what's tested here is completely identical as far as the front-end goes.  Just the other test should be fine.

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