8044046efb8cb48c2de154e3781bf7de99d9ea38
http://lists.cs.uiuc.edu/pipermail/cfe-dev/2008-July/002157.html Essentially the observer mechanism in LiveVariables was observing block-level expressions multiple times, leading to a case where the dead store checker could see a value as dead when it was really live. llvm-svn: 53115
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