MemorySSA: Fix example in header comment.

This fixes the example so that it matches the pass's behavior. I was a
little confused by the example until I tried running it and realized that
there was a mistake.

Differential Revision: http://reviews.llvm.org/D20657

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@270811 91177308-0d34-0410-b5e6-96231b3b80d8
1 file changed