Chris Lattner 8f416f3afd Add a testcase for GCC PR 23455, which lpre handles now. Add some
comments about why we're not getting other cases.


git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@61032 91177308-0d34-0410-b5e6-96231b3b80d8
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