John McCall 82bd5eaa71 Centralize the logic to permanently unify two instructions and make sure
it establishes a context and does a complaining diff.  Also make sure we
unify the prelude and postlude of a diff after a block-diff call.



git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@109744 91177308-0d34-0410-b5e6-96231b3b80d8
2010-07-29 09:20:34 +00:00
..