[Bug libc/24088] VSCR field is not being correctly read in ucontext_t on ppc64le

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https://sourceware.org/bugzilla/show_bug.cgi?id=24088

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https://sourceware.org/git/gitweb.cgi?p=glibc.git;h=0bc9bdf159f43c50ec31e9a1670e2e04b5d4060d

commit 0bc9bdf159f43c50ec31e9a1670e2e04b5d4060d
Author: Rogerio Alves <rcardoso@linux.ibm.com>
Date:   Mon Nov 5 10:18:38 2018 -0600

    powerpc: Fix VSCR position in ucontext (bug 24088)

    This patch fix VSCR position on ucontext. VSCR was read in the wrong
    position on ucontext structure because it was ignoring the machine
    endianess.

        [BZ #24088]
        * sysdeps/unix/sysv/linux/powerpc/sys/ucontext.h (vscr_t): Added
        ifdef to fix read of VSCR.
        * sysdeps/powerpc/powerpc64/Makefile [$subdir == stdlib]: Add
        tst-ucontext-ppc64-vscr.c to test list.
        * sysdeps/powerpc/powerpc64/tst-ucontext-ppc64-vscr.c: New test file.

    Reviewed-by: Tulio Magno Quites Machado Filho <tuliom@linux.ibm.com>

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

Summary of changes:
 ChangeLog                                          |    8 ++
 sysdeps/powerpc/powerpc64/Makefile                 |    5 +
 .../powerpc/powerpc64/tst-ucontext-ppc64-vscr.c    |   84 ++++++++++++++++++++
 sysdeps/unix/sysv/linux/powerpc/sys/ucontext.h     |    5 +
 4 files changed, 102 insertions(+), 0 deletions(-)
 create mode 100644 sysdeps/powerpc/powerpc64/tst-ucontext-ppc64-vscr.c

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