Review Request (XS): 7162094 initalize _call_node on both returning paths

[Nils Eliasson]

Fix for a crash experienced when playing around with late_inlining.

One line move - DirectCallGenerator::generate now initalizes _call_node 
on all returning paths.

http://cr.openjdk.java.net/~neliasso/7162094/webrev.01/ 
<http://cr.openjdk.java.net/%7Eneliasso/7162094/webrev.01/>

Thanks,
Nils
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