Merging r196724:

Merging r196724:
------------------------------------------------------------------------
r196724 | tnorthover | 2013-12-08 07:24:55 -0800 (Sun, 08 Dec 2013) | 5 lines

ARM: teach Sema that "r" can match 64-bit values

We already support using "r" on 64-bit values (a GPRPair is
allocated), but Sema doesn't know this yet so issues a warning. This
should fix it.
------------------------------------------------------------------------

git-svn-id: https://llvm.org/svn/llvm-project/cfe/branches/release_34@196746 91177308-0d34-0410-b5e6-96231b3b80d8