Clean up after verifier changes wrt. conflict/undefined reg.

Remove unused path in RegType::Merge() and compare undefined
type as pointers. Reduce the number of edges to merge in
b_22331663.smali to just those that we really want to test.

Bug: 22331663
Change-Id: I16b83c4c97fd40be9dd246ef13ccda6e924eef60
2 files changed