[ARM][NFC] Refactor sequential access for DSP
    
With a view to support parallel operations that have their results
stored to memory, refactor the consecutive access helper out so it
could support stores instructions.

Differential Revision: https://reviews.llvm.org/D48872


git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@336195 91177308-0d34-0410-b5e6-96231b3b80d8
1 file changed