[Bug 206990] powerpc (32-bit), projects/clang380-import vs. 11.0-CURRENT's sendsig: need to avoid signal delivery trashing the stack and so causing SIGSEGV

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https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=206990

--- Comment #17 from Mark Millard <markmi at dsl-only.net> ---
(In reply to Justin Hibbits from comment #16)

I've recently finally updated my powerpc contexts,
including 32-bit without so-called red-zone use.

It is working so far (G5, G4, and G3 examples for
32-bit and G5 for 64-bit). But not extensively
tested yet.

There was another, later fix in llvm than has been
listed here, again tied to stack operation ordering
but not specifically to the no-red-zone requirement.
llvm master -r303257 but there was a separate patch
for 4.0.0 because the update did not apply. There
was a PR33070 to have 4.0.1 updated. -r303257
goes back to 2017-May-17 or so. llvm PR33070 is
listed as fixed already.

llvm bugzilla 26519 can probably be listed as fully
fixed now: the -r303257 related stuff was the last
of the fixes for respecting criteria for the ordering
of stack operations for 32-bit.

Thanks go to Krzysztof Parzyszek for supplying all
the fixes involved.

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