Request for reviews (XS): 6857661: 64-bit server VM: assert(is_Initialize(),"invalid node class")

[Vladimir Kozlov]

http://cr.openjdk.java.net/~kvn/6857661/webrev.00

Fixed 6857661: 64-bit server VM: assert(is_Initialize(),"invalid node class")

Problem:
It is regression after 6840775 fix.
The secondary raw memory barrier (Initialize node)
is misplaced on zero length path in generate_arraycopy().
It should be generated only if the path is not dead
(in the bug case the copy length is negative) and only
after a zeroing code for a new allocated object.

Solution:
Move the secondary raw memory barrier to the correct place.

Reviewed by:

Fix verified (y/n): y, bug's test

Other testing:
JPRT