[asan] Mark asan-symbolize-sanity-test.cc as UNSUPPORTED on x86_64-apple

[asan] Mark asan-symbolize-sanity-test.cc as UNSUPPORTED on x86_64-apple
and x86_64h-apple.

Mark the test as UNSUPPORTED to fix a bot that is failing.

http://lab.llvm.org:8080/green/job/clang-stage2-configure-Rlto_check

The bot is failing because asan_symbolize.py cannot tell whether the
reported address is from an x86_64 slice or an x86_64h slice by the
length of the address alone, so it ends up passing the wrong arch to
atos.

rdar://problem/27907889

llvm-svn: 279614