[LLVMbugs] Loop-simplify / preheader bug

[Vikram S. Adve]

The loop-simplify pass (called via LICM) crashes on some code produced
by preselection for anagram.main().

bugpoint badmain.bc -loopsimplify -disable-adce reduces the test case to
the one attached here.  bugpoint crashes if I don't use -disable-adce,
which I assume is calling the loopsimplify pass.

opt -loopsimplify bugpoint-reduced-simplified.bc reproduces the bug.

--Vikram Adve

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 VIKRAM S. ADVE
 Assistant Professor                        E-MAIL: vadve at cs.uiuc.edu
 Department of Computer Science             PHONE:  (217) 244-2016
 Univ. of Illinois at Urbana-Champaign      FAX:    (217) 244-6869
 1304 W. Springfield Ave.               http://www.cs.uiuc.edu/~vadve
 Urbana IL 61801-2987.
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