[compiler-rt] r346215 - [sanitizer] Use AT_EXECFN in ReExec() if available

[Jeremy Morse via llvm-commits]

I think this has to be reverted -- as it's broken a public bot, it means
there's definitely a substantial portion of LLVM developers who can't get
clean test results (including us downstream in Sony), fouling everyone's CI.

If your CI problem is caused locally then that's not LLVMs concern of
course; but if the whole feature is broken/flakey and it only gets exposed
locally, it's probably better to disable the whole category of tests until
its fixed, or revert whatever caused your local breakage further back in
history. That way no-one ends up testing something that's known to be
broken.

--
Thanks,
Jeremy
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