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

[Ulrich Weigand via cfe-commits]

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+; Simulate register pressure  around setjmp call for double precision 
+; arguments and return sum of 20 vaiables. It also prints the variables.
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uweigand wrote:

As this is not an executable test, I don't think the printf code-gen tests anything relevant.   The above register pressure test should be sufficient.

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