libsanitizer merge 168699

[Konstantin Serebryany]

Hi,

This is libsanitizer merge from upstream 168699.
Tested on x86_64 Ubuntu 12.04 with:
rm -rf */{*/,}libsanitizer \
  && make -j 50 \
  && make -C gcc check-g{cc,++}
RUNTESTFLAGS='--target_board=unix\{-m32,-m64\} asan.exp'

Ok to commit?

--kcc
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