[Bug build/18116] build failure on ppc64le: setcontext.S uses power6 mtfsf when not supported

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https://sourceware.org/bugzilla/show_bug.cgi?id=18116

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https://sourceware.org/git/gitweb.cgi?p=glibc.git;h=db8fed87d9741b6b3da6c2257f01d63ef2fe407c

commit db8fed87d9741b6b3da6c2257f01d63ef2fe407c
Author: Martin Sebor <msebor@redhat.com>
Date:   Mon Jun 1 14:12:09 2015 -0300

    powerpc: setcontext.S uses power6 mtfsf when not supported [BZ #18116]

    The attached patch fixes a glibc build failure with gcc 5 on powerpc64le
    caused by a recent change in gcc where the compiler defines the
    _ARCH_PWR6 macro when processing assembly files but doesn't invoke the
    assembler in the corresponding machine mode (unless it has been
    explicitly configured to target POWER 6 or later).  A bug had been filed
    with gcc for this (65341) but was closed as won't fix. Glibc relies on
    the _ARCH_PWR6 macro in a few .S files to make use of Power ISA 2.5
    instructions (specifically, the four-argument form of the mtfsf insn).
    A similar problem had occurred in the past (bug 10118) but the fix that
    was committed for it didn't anticipate this new problem.

-----------------------------------------------------------------------

Summary of changes:
 ChangeLog                                          |    9 +++++
 .../unix/sysv/linux/powerpc/powerpc64/setcontext.S |   30 +++++++++++++---
 .../sysv/linux/powerpc/powerpc64/swapcontext.S     |   36 +++++++++++++++----
 3 files changed, 61 insertions(+), 14 deletions(-)

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