[PATCH] fix incorrect codegen from instcombine (PR17827)

[Kay Tiong Khoo]

Detailed description of problem in instcombine's compare optimizer:
http://llvm.org/bugs/show_bug.cgi?id=17827

Fix suggested by Henrique Santos via dev mailing list:
http://lists.cs.uiuc.edu/pipermail/llvmdev/2013-November/067822.html
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