[Bug 240928] clang segfault when compiling with -march=bonnel (CPUTYPE=atom in make.conf)

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https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=240928

--- Comment #4 from commit-hook at freebsd.org ---
A commit references this bug:

Author: dim
Date: Thu Oct  3 06:08:05 UTC 2019
New revision: 353031
URL: https://svnweb.freebsd.org/changeset/base/353031

Log:
  MFC r352915:

  Pull in r357528 from upstream llvm trunk (by Craig Topper):

    [X86] Check MI.isConvertibleTo3Addr() before calling
    convertToThreeAddress in X86FixupLEAs.

    X86FixupLEAs just assumes convertToThreeAddress will return nullptr
    for any instruction that isn't convertible.

    But the code in convertToThreeAddress for X86 assumes that any
    instruction coming in has at least 2 operands and that the second one
    is a register. But those properties aren't guaranteed of all
    instructions. We should check the instruction property first.

  Pull in r365720 from upstream llvm trunk (by Craig Topper):

    [X86] Don't convert 8 or 16 bit ADDs to LEAs on Atom in FixupLEAPass.

    We use the functions that convert to three address to do the
    conversion, but changing an 8 or 16 bit will cause it to create a
    virtual register. This can't be done after register allocation where
    this pass runs.

    I've switched the pass completely to a white list of instructions
    that can be converted to LEA instead of a blacklist that was
    incorrect. This will avoid surprises if we enhance the three address
    conversion function to include additional instructions in the future.

    Fixes PR42565.

  This should fix assertions/segfaults when compiling certain ports with
  CPUTYPE=atom.

  PR:           240928

Changes:
_U  stable/11/
  stable/11/contrib/llvm/lib/Target/X86/X86FixupLEAs.cpp
_U  stable/12/
  stable/12/contrib/llvm/lib/Target/X86/X86FixupLEAs.cpp

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