Fix bot failures from r308114

Finally figured out that some bots were failing from r308114
with the message:
  llvm-lto2: LTO::run failed: No available targets are compatible with this triple.
after adding in some other checking that finally caused this to show up
in the FileCheck output.

Added "REQUIRES: x86-registered-target" which should fix it.

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@308119 91177308-0d34-0410-b5e6-96231b3b80d8
1 file changed