[MIPS] Fix atomic_is_lock_free test for mips32.
On 32-bit MIPS, 64-bit atomic ops are achieved through locks.
So allow the test to fail for atomic_intmax_t on 32-bit MIPS.

(cherry picked from commit f1837377d215a6eda294b6ac7552b226deee91ce)

Change-Id: I973d999c31c9ab89b5a7b709beff6486b93408f2
1 file changed