review(M): 7144296: PS: Optimize nmethods processing

Fri Feb 10 20:44:10 UTC 2012

This change does two things: 
1. Prunes the "scavenge roots in code" list after each minor GC.
2. Promotes objects pointed by code directly into the old gen, instead of ping-ponging them in the survivor spaces.

Webrev: http://cr.openjdk.java.net/~iveresov/7144296/webrev.00/

Thanks!
igor

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