ARM: Add dbg builtin intrinsic

git-svn-id: https://llvm.org/svn/llvm-project/cfe/trunk@216452 91177308-0d34-0410-b5e6-96231b3b80d8
arm_acle: Add mappings for dbg intrinsic

This completes all ACLE hint intrinsics.

git-svn-id: https://llvm.org/svn/llvm-project/cfe/trunk@216453 91177308-0d34-0410-b5e6-96231b3b80d8