Add suppressions for valgrind's "Unrecognised instruction" failures.
Merge pull request #768 from vasslitvinov/suppress-valgrind-Unrecognised-instruction-failures

Add suppressions for valgrind's "Unrecognised instruction" failures.

Summary: these are valid "lock xadd" instructions,
valgrind handles them as of 3.9.0, whereas we are running 3.8.1.

DETAILS

types/atomic/ferguson/atomictest
  unhandled instruction bytes: 0xF0 0xF 0xC0 0x10 0x89 0xD0 0x5D 0xC3
types/atomic/sungeun/atomic_vars
  unhandled instruction bytes: 0xF0 0xF 0xC0 0xA 0x89 0xCE 0x1 0xF0

valgrind bug
  https://bugs.kde.org/show_bug.cgi?id=307106
valgrind release notes quoting this bug
  http://lwn.net/Articles/572790/

CREDITS
  Greg for taking the lead and decoding the instruction bytes
  Lydia for agreeing with the idea of adding these tests to suppressions