[Bug 1563420] Re: valgrind: Backport Valgrind patches for s390 to Ubuntu 16.04

[ChristianEhrhardt]

I was at debugging at IBM when we said we need to open that, thanks a lot Dann!
This will help to speed up some debugging.

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Title:
  valgrind: Backport Valgrind patches for s390 to Ubuntu 16.04

Status in Ubuntu on IBM z Systems:
  Fix Released
Status in valgrind package in Ubuntu:
  Fix Released

Bug description:
  The following patches for s390 need to be picked for Valgrind:

  * r15702 -- s390x: Crash with certain glibc versions due to
    non-implemented TBEGIN (https://bugs.kde.org/show_bug.cgi?id=353680)
    Note that this is also needed when using a glibc with vector-accelerated
    string functions.

  * r15792/VEX r3210 -- s390x: popcnt (B9E1) not implemented
    (https://bugs.kde.org/show_bug.cgi?id=359289)

  * r15806 -- s390: wire up separate socketcalls system calls
    (https://bugs.kde.org/show_bug.cgi?id=359703)
    This is needed when using a kernel that has separate system calls for
    socket functions.

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