Fix aliases to thumbfunc-based exprs to be thumbfunc.

If F is a Thumb function symbol, and G = F + const, and G is a
function symbol, then G is Thumb. Because what else could it be?

Differential Revision: https://reviews.llvm.org/D28878

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@292514 91177308-0d34-0410-b5e6-96231b3b80d8
2 files changed