RFR(S): 8166742 : SIGFPE in C2 Loop IV elimination

[Chuck Rasbold]

A small fix for an edge case crash in C2...

Bug: https://bugs.openjdk.java.net/browse/JDK-8166742
Webrev: http://cr.openjdk.java.net/~rasbold/8166742/webrev.00/

Requesting a sponsor and reviews.  Thanks.

-- Chuck
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