Revert r337333, "Teach Clang to emit address-significance tables."

Revert r337333, "Teach Clang to emit address-significance tables."

Causing multiple failures on sanitizer bots due to TLS symbol errors,
e.g.

/usr/bin/ld: __msan_origin_tls: TLS definition in /home/buildbots/ppc64be-clang-test/clang-ppc64be/stage1/lib/clang/7.0.0/lib/linux/libclang_rt.msan-powerpc64.a(msan.cc.o) section .tbss.__msan_origin_tls mismatches non-TLS reference in /tmp/lit_tmp_0a71tA/mallinfo-3ca75e.o

git-svn-id: https://llvm.org/svn/llvm-project/cfe/trunk@337336 91177308-0d34-0410-b5e6-96231b3b80d8