Request for reviews (M): 6910618: C2: Error: assert(d->is_oop(),"JVM_ArrayCopy: dst not an oop")

[Vladimir Kozlov]

http://cr.openjdk.java.net/~kvn/6910618/webrev.00

Fixed 6910618: C2: Error: assert(d->is_oop(),"JVM_ArrayCopy: dst not an oop")

Problem:
If deoptimization happened on the return from a call which
which returns oop, the oop will be not updated during GC which
is triggered by scalar replaced objects reallocation.

Solution:
Mark in PcDesc call sites which return oop (this is main part of changes)
and save the result oop across objects reallocation during deoptimization.

Reviewed by:

Fix verified (y/n): y, test

Other testing:
JPRT