[mips] Partially revert r334031

The test changes in r334031 give unstable pass/fail results on the
llvm-clang-x86_64-expensive-checks-win buildbot. Revert the test changes to
turn the bot green.

llvm-svn: 334084
GitOrigin-RevId: 0bba0df896b7439db4b9368f526b5fb457d94ce7
1 file changed