[ARM] MVE predicate register support

This adds support code for building and shuffling i1 predicate registers. It
generally uses two basic principles, either converting the predicate into an
scalar (through a PREDICATE_CAST) and doing scalar operations on it there, or
by converting the register to an full vector register and back.

Some of the code here is a not super efficient but will hopefully cover most
cases of moving i1 vectors around and can be improved in subsequent patches.

Some code by David Sherwood.

Differential Revision: https://reviews.llvm.org/D65052

llvm-svn: 366890