Request for reviews (S): 6791572: assert("duplicating node that's already been matched")

[Vladimir Kozlov]

http://cr.openjdk.java.net/~kvn/6791572/webrev.00

Fixed 6791572: assert("duplicating node that's already been matched")

Problem:
AddP, LShiftX nodes and their inputs are marked as visited
on x86 during the first address expression processing.
AddP, LShiftX inputs will be not marked as shared since
AddP, LShiftX will be marked as shared first.
And this causes the problem since after AddP, LShiftX
are folded into address expressions their inputs
will be shared by several address expressions.

Solution:
Delay marking nodes as visited if they are inputs
to an address expression.

Reviewed by:

Fix verified (y/n): y, test case

Other testing:
JPRT