[Bug math/21967] When 512-bit AVX2 wrapper functions in mathvec are used?

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https://sourceware.org/bugzilla/show_bug.cgi?id=21967

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https://sourceware.org/git/gitweb.cgi?p=glibc.git;h=ace02433fe2f0ce124d191bb273f738ef56fe387

commit ace02433fe2f0ce124d191bb273f738ef56fe387
Author: H.J. Lu <hjl.tools@gmail.com>
Date:   Fri Aug 25 11:01:03 2017 -0700

    x86: Add MathVec_Prefer_No_AVX512 to cpu-features [BZ #21967]

    AVX512 functions in mathvec are used on machines with AVX512.  An AVX2
    wrapper is also provided and it can be used when the AVX512 version
    isn't profitable.  MathVec_Prefer_No_AVX512 is addded to cpu-features.
    If glibc.tune.hwcaps=MathVec_Prefer_No_AVX512 is set in GLIBC_TUNABLES
    environment variable, the AVX2 wrapper will be used.

        [BZ #21967]
        * sysdeps/x86/cpu-features.h (bit_arch_MathVec_Prefer_No_AVX512):
        New.
        (index_arch_MathVec_Prefer_No_AVX512): Likewise.
        * sysdeps/x86/cpu-tunables.c (TUNABLE_CALLBACK (set_hwcaps)):
        Handle MathVec_Prefer_No_AVX512.

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