RFR: 8334491: GenShen: Revert changes to Shenandoah defaults

[Kelvin Nilsen]

On Tue, 18 Jun 2024 18:08:02 GMT, William Kemper <wkemper at openjdk.org> wrote:

> On the genshen branch, we have changed the adaptive heuristics decay factor to 0.1 and increased the learning cycles to 10. Testing with the original defaults of 0.5 and 5 (respectively) shows modest performance improvements in specjbb and extremem.

Marked as reviewed by kdnilsen (Committer).

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PR Review: https://git.openjdk.org/shenandoah/pull/450#pullrequestreview-2126511373