Fix a crashing bug in SplitBlock when it is called on a block with no
dominator information even though dominators were previously computed.

Patch by Nick Sumner.

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@138449 91177308-0d34-0410-b5e6-96231b3b80d8
1 file changed