Revert r331819 [GlobalISel][Legalizer] More concise and faster widenScalar, NFC

Reverting this to see if the clang-cmake-aarch64-global-isel and
clang-cmake-aarch64-quick bots are failing because of this commit

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@331839 91177308-0d34-0410-b5e6-96231b3b80d8
6 files changed