[ARM] Fix lsrl with a 128/256 bit shift amount or a shift of 32

[ARM] Fix lsrl with a 128/256 bit shift amount or a shift of 32

This patch fixes shifts by a 128/256 bit shift amount. It also fixes
codegen for shifts of 32 by delegating to LLVM's default optimisation
instead of emitting a long shift.

Tests that used to generate long shifts of 32 are updated to check for the
more optimised codegen.

Differential revision: https://reviews.llvm.org/D66519

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@369626 91177308-0d34-0410-b5e6-96231b3b80d8