[Bug malloc/21754] malloc: Perform as little work as possible after heap consistency check failures

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https://sourceware.org/bugzilla/show_bug.cgi?id=21754

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https://sourceware.org/git/gitweb.cgi?p=glibc.git;h=ac3ed168d0c0b2b702319ac0db72c9b475a8c72e

commit ac3ed168d0c0b2b702319ac0db72c9b475a8c72e
Author: Florian Weimer <fweimer@redhat.com>
Date:   Wed Aug 30 19:29:38 2017 +0200

    malloc: Remove check_action variable [BZ #21754]

    Clean up calls to malloc_printerr and trim its argument list.

    This also removes a few bits of work done before calling
    malloc_printerr (such as unlocking operations).

    The tunable/environment variable still enables the lightweight
    additional malloc checking, but mallopt (M_CHECK_ACTION)
    no longer has any effect.

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

Summary of changes:
 ChangeLog          |   27 +++++++++
 malloc/arena.c     |   11 +---
 malloc/hooks.c     |   55 ++-----------------
 malloc/malloc.c    |  152 ++++++++++-----------------------------------------
 manual/memory.texi |    1 -
 manual/probes.texi |    7 ---
 6 files changed, 65 insertions(+), 188 deletions(-)

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