Revert "[ARM] Promote small global constants to constant pools"

This reverts commit r281213. It made a bot go bang: http://lab.llvm.org:8011/builders/clang-cmake-armv7-a15-full/builds/14625

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@281228 91177308-0d34-0410-b5e6-96231b3b80d8
5 files changed