[9] RFR(S): 8039425: Code cleanup: PhaseIterGVN::optimize()

[Albert]

Hi,

could I get reviews for this patch?

*Bug:*
https://bugs.openjdk.java.net/browse/JDK-8039425

*Problem:*
The code in PhaseIterGVN::optimize() is hard to read.

*Solution:*
This code cleanup aims at improving code readability.

*Webrev:*
http://cr.openjdk.java.net/~anoll/8039425/webrev.00/

Many thanks in advance,
Albert
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