RFR(XS): 8028198: SIGSEGV in PhaseIdealLoop::build_loop_late_post

[Rickard Bäckman]

Hi,

can I have this change reviewed please?
In some cases the optimizer decided to split a MathExact node through a
Phi creating an invalid pattern where there is a Phi between the
MathExact and its projections. The fix is to not allow split_thru_phi
for MathExact nodes.

Webrev: http://cr.openjdk.java.net/~rbackman/8028198/
Bug: https://bugs.openjdk.java.net/browse/JDK-8028198

Thanks
/R
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