Split IntrReadArgMem into IntrReadMem and IntrArgMemOnly

Summary:
IntrReadWriteArgMem simply becomes IntrArgMemOnly.

So there are fewer intrinsic properties that express their orthogonality
better, and correspond more closely to the corresponding IR attributes.

Suggested by: Philip Reames

Reviewers: joker.eph, reames, tstellarAMD

Subscribers: jholewinski, arsenm, llvm-commits

Differential Revision: http://reviews.llvm.org/D19291

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@267021 91177308-0d34-0410-b5e6-96231b3b80d8
14 files changed