Philip Reames 710fde8868 [docs] Update DominatorTree docs to clarify expectations around unreachable blocks
Note: I'm am not trying to describe what "should be"; I'm only describing what is true today.

This came out of my recent question to llvm-dev titled: When can the dominator tree not contain a node for a basic block?

Differential Revision: http://reviews.llvm.org/D13078



git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@248417 91177308-0d34-0410-b5e6-96231b3b80d8
2015-09-23 18:39:37 +00:00
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