[ARM] Move SMULW[B|T] isel to DAG Combine

Create nodes for smulwb and smulwt and move their selection from
DAGToDAG to DAG combine. smlawb and smlawt can then be selected
using tablegen. Added some helper functions to detect shift patterns
as well as a wrapper around SimplifyDemandBits. Added a couple of
extra tests.

Differential Revision: https://reviews.llvm.org/D30708

llvm-svn: 297716