[MIPS GlobalISel] Lower G_UADDE and narrowScalar G_ADD

Lower G_UADDE and legalize G_ADD using narrowScalar on MIPS32.

Differential Revision: https://reviews.llvm.org/D54580


git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@349346 91177308-0d34-0410-b5e6-96231b3b80d8
4 files changed