[ARM] Don't promote i1 types in ARM CGP

Now that we have mixed type sizes, i1 values need to be explicitly
handled as we want to avoid promoting these values.

Differential Revision: https://reviews.llvm.org/D54308


git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@346499 91177308-0d34-0410-b5e6-96231b3b80d8
3 files changed