Add a test for big-endian NEON on ARM64.

The enabled test #includes <arm_neon.h>, which is sufficient to test all
the code in r207624.

git-svn-id: https://llvm.org/svn/llvm-project/cfe/trunk@207641 91177308-0d34-0410-b5e6-96231b3b80d8
Android uses -fpic for arm64 as well.


git-svn-id: https://llvm.org/svn/llvm-project/cfe/trunk@207642 91177308-0d34-0410-b5e6-96231b3b80d8