Nick Lewycky f8e046b148 It's possible that an all-zero GEP may be used as the argument to lifetime
intrinsics. In fact, we'll optimize a bitcast to that when possible. Detect it
when looking for the lifetime intrinsics.

No test case, noticed by inspection.

llvm-svn: 132906
2011-06-13 07:52:46 +00:00
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