SelectionDAGBuilder: update comment in HandlePHINodesInSuccessorBlocks.

From what I can tell, the code is checking for PHIs that expect any value from
this block, not just constants.

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@232697 91177308-0d34-0410-b5e6-96231b3b80d8
1 file changed