Merging r280143:

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r280143 | dberlin | 2016-08-30 12:58:48 -0700 (Tue, 30 Aug 2016) | 2 lines

IntrArgMemOnly is only defined (and current AA machinery only sanely supports) pointer arguments, and these intrinsics have vector of pointer arguments.  Remove ArgMemOnly until we either have the machinery, define a new attribute, or something similar

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llvm-svn: 287777