git: openjdk/leyden: premain: Backport some of the JEP2 review changes

[duke]

Changeset: 2c2289b1
Branch: premain
Author:    Igor Veresov <igor.veresov at oracle.com>
Date:      2025-03-28 18:41:23 +0000
URL:       https://git.openjdk.org/leyden/commit/2c2289b153823b747637fd603c5305888a2c1935

Backport some of the JEP2 review changes

! src/hotspot/share/cds/metaspaceShared.cpp
! src/hotspot/share/oops/methodCounters.hpp
! src/hotspot/share/oops/recompilationSchedule.cpp
! src/hotspot/share/oops/recompilationSchedule.hpp
! src/hotspot/share/oops/trainingData.cpp
! src/hotspot/share/oops/trainingData.hpp