Add error checking to reject neon_vector_type attribute on targets without NEON.

Patch by Artyom Skrobov.


git-svn-id: http://llvm.org/svn/llvm-project/cfe/trunk@190801 91177308-0d34-0410-b5e6-96231b3b80d8
Updated the way the ownership attributes are semantically diagnosed.  Added test cases for the semantics checks.

git-svn-id: http://llvm.org/svn/llvm-project/cfe/trunk@190802 91177308-0d34-0410-b5e6-96231b3b80d8