[Bug 246630] stable/11 regression: base.txz reproducibility depends on number of cpu cores

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https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=246630

--- Comment #33 from Dimitry Andric <dim at FreeBSD.org> ---
Created attachment 215531
  --> https://bugs.freebsd.org/bugzilla/attachment.cgi?id=215531&action=edit
Merge llvm-project commit 0cecafd647cc

I have been able to consistently reproduce the different outputs with a script,
and by bisecting on a 11.x machine (which took a LONG time!) I found that
upstream's https://reviews.llvm.org/rG0cecafd647cc fixes it for my case.

That is, resetting CLANG_SPAWN_CC1 back to 0 and merging the non-test parts of
the upstream change into our contrib/llvm-project seems to make this output
reproducible again for me.

I would appreciate it if you could apply this on your various systems as a
test-run, and check if it now produces consistent output every time.

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