Loosen this test.

Looks like there is a big endian/little endian problem here. Loosen the
test to try to get the bots green while llvm builds on a ppc qemu vm.

The failure was in http://lab.llvm.org:8011/builders/clang-ppc64-elf-linux2/

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@178839 91177308-0d34-0410-b5e6-96231b3b80d8