[GISel][ARM]: Fix illegal Generic copies in tests

This is in preparation for a verifier check that makes sure
copies are of the same size (when generic virtual registers are involved).

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@316388 91177308-0d34-0410-b5e6-96231b3b80d8
4 files changed