[MSSA] Fix a bug in MemorySSA's move ctor.

Not a correctness issue, but it would be nice if we didn't have to
recompute our block numbering (worst-case) every time we move MSSA.


git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@277652 91177308-0d34-0410-b5e6-96231b3b80d8
1 file changed