git: openjdk/leyden: premain: Enable -Xshare:on by default for new workflow -- so people know immediately if the Leyden optimizations are disabled due to a misconfiguration

[duke]

Changeset: 485dee94
Author:    iklam <ilam3388 at gmail.com>
Date:      2024-06-03 20:24:41 +0000
URL:       https://git.openjdk.org/leyden/commit/485dee945f5fcd9ffab609620e7556f549e27313

Enable -Xshare:on by default for new workflow -- so people know immediately if the Leyden optimizations are disabled due to a misconfiguration

! README.md
! src/hotspot/share/cds/cdsConfig.cpp
! src/hotspot/share/cds/cdsConfig.hpp
! src/hotspot/share/runtime/arguments.cpp
! test/hotspot/jtreg/runtime/cds/appcds/leyden/ExcludedClasses.java
! test/hotspot/jtreg/runtime/cds/appcds/leyden/LeydenGCFlags.java