[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 #7 from commit-hook at freebsd.org ---
A commit references this bug:

Author: dim
Date: Thu May  4 21:40:17 UTC 2017
New revision: 317810
URL: https://svnweb.freebsd.org/changeset/base/317810

Log:
  Pull in r302183 from upstream llvm trunk (by Krzysztof Parzyszek):

    [PPC] When restoring R30 (PIC base pointer), mark it as <def>

    This happened on the PPC32/SVR4 path and was discovered when building
    FreeBSD on PPC32. It was a typo-class error in the frame lowering
    code.

    This fixes PR26519.

  Reported by:  Mark Millard
  PR:           206990
  MFC after:    3 days

Changes:
  head/contrib/llvm/lib/Target/PowerPC/PPCFrameLowering.cpp

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