libsanitizer merge from upstream r175733

gcc/ChangeLog

gcc/config/i386/i386.c

libsanitizer/ChangeLog

libsanitizer/MERGE

libsanitizer/asan/asan_flags.h

libsanitizer/asan/asan_intercepted_functions.h

libsanitizer/asan/asan_interceptors.cc

libsanitizer/asan/asan_internal.h

libsanitizer/asan/asan_mac.cc

libsanitizer/asan/asan_mapping.h

libsanitizer/asan/asan_report.cc

libsanitizer/asan/asan_rtl.cc

libsanitizer/asan/dynamic/asan_interceptors_dynamic.cc

libsanitizer/include/sanitizer/asan_interface.h

libsanitizer/include/sanitizer/common_interface_defs.h

libsanitizer/sanitizer_common/Makefile.am

libsanitizer/sanitizer_common/Makefile.in

libsanitizer/sanitizer_common/sanitizer_common.cc

libsanitizer/sanitizer_common/sanitizer_common.h

...itizer/sanitizer_common/sanitizer_common_interceptors.inc