Fix issue with test that caused bildbot failure

These tests did not specify the target. 
The failure was triggered by change - 
https://reviews.llvm.org/D33205
http://lab.llvm.org:8011/builders/clang-cmake-armv7-a15-full/builds/7314

which sets vector alignment to 8-byte for arm-targets (except for Android).
So, fixing the test to make it target specific. 

llvm-svn: 304210