RFR: 8341485: GenShen: Make evac tracker a non-product feature and confine it to generational mode

[Kelvin Nilsen]

On Thu, 3 Oct 2024 18:23:32 GMT, William Kemper <wkemper at openjdk.org> wrote:

> During the course of development of the generational mode, we added a feature to keep track of which threads were evacuating objects and how many evacuations lost the race. The instrumentation added unwarranted overhead. This change makes this instrumentation a non-product feature for the generational mode and removes it entirely from the non-generational modes.

Marked as reviewed by kdnilsen (Committer).

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PR Review: https://git.openjdk.org/shenandoah/pull/506#pullrequestreview-2346577982