[libsanitizer] merge from upstream r168514

gcc/testsuite/ChangeLog

gcc/testsuite/c-c++-common/asan/memcmp-1.c

libsanitizer/ChangeLog

libsanitizer/MERGE

libsanitizer/asan/asan_allocator.cc

libsanitizer/asan/asan_intercepted_functions.h

libsanitizer/asan/asan_interceptors.cc

libsanitizer/asan/asan_internal.h

libsanitizer/asan/asan_linux.cc

libsanitizer/asan/asan_mac.cc

libsanitizer/asan/asan_mac.h

libsanitizer/asan/asan_malloc_mac.cc

libsanitizer/asan/asan_mapping.h

libsanitizer/asan/asan_new_delete.cc

libsanitizer/asan/asan_report.cc

libsanitizer/asan/asan_rtl.cc

libsanitizer/asan/asan_stats.cc

libsanitizer/asan/asan_thread.cc

libsanitizer/asan/asan_thread_registry.cc

libsanitizer/asan/asan_thread_registry.h