[asan] Disable globals-gc test with ld.bfd.
Fails on clang-cmake-armv7-a15-full.
// RUN: %clangxx_asan %s -o %t -Wl,--gc-sections -fuse-ld=bfd -ffunction-sections -fdata-sections -mllvm -asan-globals=1
// https://code.google.com/p/address-sanitizer/issues/detail?id=260
+// UNSUPPORTED: *
int undefined();
