libsanitizer: merge from master.

libsanitizer/MERGE

libsanitizer/asan/asan_fuchsia.cpp

libsanitizer/asan/asan_globals.cpp

libsanitizer/asan/asan_interceptors.h

libsanitizer/asan/asan_mapping.h

libsanitizer/asan/asan_report.cpp

libsanitizer/asan/asan_rtl.cpp

libsanitizer/asan/asan_thread.cpp

libsanitizer/asan/asan_thread.h

libsanitizer/include/sanitizer/memprof_interface.h

libsanitizer/interception/interception.h

libsanitizer/interception/interception_linux.cpp

libsanitizer/interception/interception_linux.h

libsanitizer/lsan/lsan.cpp

libsanitizer/lsan/lsan_common.cpp

libsanitizer/lsan/lsan_common.h

libsanitizer/lsan/lsan_common_fuchsia.cpp

libsanitizer/lsan/lsan_common_linux.cpp

libsanitizer/lsan/lsan_interceptors.cpp

libsanitizer/lsan/lsan_posix.h