Request for reviews (M): 7112478: after 7105605 JRuby bench_define_method_methods.rb fails with NPE

[Vladimir Kozlov]

http://cr.openjdk.java.net/~kvn/7112478/webrev

7112478: after 7105605 JRuby bench_define_method_methods.rb fails with NPE

7105605 optimization is good stress test for EA :)

Added missing edges from arraycopy's destination fields to fields of source 
object. Mark source object as global escape if we are not sure that all edges 
are created.

EA bytecode analyzer gives incorrect information about returned object if there 
were state merges with processed block. Also call's result missed reference to 
returned arguments and unknown object when not only arguments is returned.

Added missing reference to NULL from array elements with OffsetBot offset.

Make sure that LocalVar and Field have edge to at least unknown object before 
removing deferred edges from the graph.

Moved escaped state propagation code to execute it after Connection Graph is 
completed and skip the rest of code if all objects globally escaped.

Also added accessors to check for null and unknown pointers. And don't add 
fields edges to NULL pointer object.

Tested with CTW, nsk, compiler regression tests, failed java/util tests

Thanks,
Vladimir