RFR(XS): 8028207: assert(_outcnt==1) failed: not unique in compile.cpp

[Rickard Bäckman]

Hi,

can I have this small change reviewed please?
When having two MathExactNodes with identical input, where one doesn't
dominate the other we get a problem where the BoolNode controlling the
overflow gets multiple IfNodes.
In final_graph_reshaping we want to set the control edge of each node
that uses the result of the MathExactNode to the non-throwing branch of
that If. If there is more than one there is no way of saying which use
requires which If.

Webrev: http://cr.openjdk.java.net/~rbackman/8028207/
Bug: https://bugs.openjdk.java.net/browse/JDK-8028207

Thanks
/R
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