The tests only specify -march, so when the tests are run on AIX the target OS defaults to AIX, which causes the tests to misbehave.
This patch constrains the tests by specifying -mtriple instead of -march.
Reviewed By: daltenty, jsji, MaskRay
Differential Revision: https://reviews.llvm.org/D110186
Modification of previously existing code (variable rename only), with unit test added.
Differential Revision: http://reviews.llvm.org/D19368
llvm-svn: 268493