[ARM64] Use %clang_cc1 consistently in the new arm64 codegen tests.
Really, all tests outside of the Driver tree should use %clang_cc1, but
these are new and easy to fix, and many of them use buitlin headers
which don't work as well without using %clang_cc1.

git-svn-id: https://llvm.org/svn/llvm-project/cfe/trunk@205147 91177308-0d34-0410-b5e6-96231b3b80d8