[Bug libc/18822] Internal functions are called via PLT

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https://sourceware.org/bugzilla/show_bug.cgi?id=18822

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The branch, hjl/pr18822 has been created
        at  5b9a7b35871fc94f42a9e0f1a034423b48d3a4e7 (commit)

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https://sourceware.org/git/gitweb.cgi?p=glibc.git;h=5b9a7b35871fc94f42a9e0f1a034423b48d3a4e7

commit 5b9a7b35871fc94f42a9e0f1a034423b48d3a4e7
Author: H.J. Lu <hjl.tools@gmail.com>
Date:   Fri Nov 24 15:58:04 2017 -0800

    Add wcharP.h to hide internal wchar functions [BZ #18822]

    For some targets, like i386 and s390, internal IFUNC functions must be
    called via PLT with a special register.  Add <wcharP.h> to allow targets,
    which don't need a special register to call internal IFUNC functions via
    PLT or have internal non-IFUNC wchar functions, to allow direct access to
    internal wchar functions within libc.so and libc.a without using GOT nor
    PLT.

    Tested on i686 and x86-64.  It removed 11 PLT relocations on i686 and
    29 PLT relocations on x86-64.

        [BZ #18822]
        * include/wchar.h: Include <wcharP.h>.
        * sysdeps/generic/wcharP.h: New file.
        * sysdeps/i386/wcharP.h: Likewise.
        * sysdeps/x86_64/wcharP.h: Likewise.

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