ARM: *-*-darwin-eabi triples should use AAPCS.

git-svn-id: https://llvm.org/svn/llvm-project/cfe/trunk@191900 91177308-0d34-0410-b5e6-96231b3b80d8
Fix test to work on Linux hosts by specifying triple.

Thought I'd checked that before

git-svn-id: https://llvm.org/svn/llvm-project/cfe/trunk@191901 91177308-0d34-0410-b5e6-96231b3b80d8