[llvm] r193137 - TBAA: fix PR17620.

Mon Oct 21 19:56:10 PDT 2013

> I tried a few combinations with -gvn, but it didn't expose the issue. What I can do is to dump the ir right before the gvn run that exposes the issue.

The attached testcase would crash with just "opt -tbaa -gvn". I found
it by running opt -O2 -debug-pass=Arguments, copying the pass list an
trimming it.

Cheers,
Rafael
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