[ARM] Do not test for CPUs, use SubtargetFeatures (Part 2). NFCI

[ARM] Do not test for CPUs, use SubtargetFeatures (Part 2). NFCI

This is a follow-up for r273544.

The end goal is to get rid of the isSwift / isCortexXY / isWhatever methods.

Since the ARM backend seems to have quite a lot of calls to these methods, I
intend to submit 5-6 subtarget features at a time, instead of one big lump.

Differential Revision: http://reviews.llvm.org/D21685

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@273853 91177308-0d34-0410-b5e6-96231b3b80d8