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

[John Coomes]

Igor Veresov (igor.veresov at oracle.com) wrote:
> 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/

Looks good.  Minor suggestion - you could use a typedef and get
meaningful names for the closures, e.g.,

typedef PSRootsClosure<true> PSScavengeRootsClosure;
typedef PSRootsClosure<false> PSPromoteRootsClosure;

To keep the existing name (PSScavengeRootsClosure) the same at the use
points, the template class has to be renamed.  I used PSRootsClosure,
but any other name would work.

-John