Clean up char/numeric comparisons in ARM getTargetDefines

Change-Id: Ie07228411b68252adcd5cf80b27ccd2eb3b031d9

git-svn-id: https://llvm.org/svn/llvm-project/cfe/trunk@193366 91177308-0d34-0410-b5e6-96231b3b80d8
1 file changed