Request for reviews (XS): 7125879: assert(proj != NULL) failed: must be found

[Vladimir Kozlov]

http://cr.openjdk.java.net/~kvn/7125879/webrev

7125879: assert(proj != NULL) failed: must be found

Case of new array with negative size known during compilation. 
AllocateArrayNode::Ideal() optimization disconnect unreachable following code 
since call to runtime will throw exception. As result there will be no users of 
i_o after the call.

Leave i_o attached to slow allocation call to avoid problems in preceding graph.

Tested with full CTW and failing test.

Thanks,
Vladimir