[SystemZ][z/OS]: fix lit tmp_dir to use - instead of _
Latest upstream change in https://reviews.llvm.org/D117179 causes lit regressions on z/OS, when TMPDIR is exported and contains _, ld linker fails, it doesnt recognize _ specified in SYSLIN. this seems a limitation on z/OS. we need to fix lit. Differential Revision: https://reviews.llvm.org/D118071
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