[LLVMdev] induction variable computation not preserving scev

[Nick Lewycky]

Hi,

I tracked down a bug in indvars where we weren't updating SCEV properly. The
attached patch shows the fix to this bug with a testcase, but it also causes
five new test failures.

Would someone be willing to take a look at the failures and figure out why
we're getting worse output once this patch is applied? If I had to hazard a
guess, I'd say that indvars is probably emitting code that can't be analyzed
by SCEV as easily as the original.

Nick
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