[jdk25u-dev] RFR: 8358529: GenShen: Heuristics do not respond to changes in SoftMaxHeapSize

[Rui Li]

3 backports in this pr:
- JDK-8358529 (For addressing cherry pick conflicts caused by 8372543)
- JDK-8372543 (The main backport I'm hoping to backport)
- JDK-8373789 (8372543 missed an import. This is the bugfix)

Even with JDK-8358529, the backport is still not clean for JDK-8372543. It's missing JDK-8365880 and more. Since the conflicts were only an assertion conflicts ([sample](https://github.com/openjdk/jdk/blame/b1e8c4e030f42ea3146b2502c9ab030bc79a8147/src/hotspot/share/gc/shenandoah/shenandoahFreeSet.cpp#L3065)), I'm skipping the complicated backport rabbit hole and picking the latest assertions. The other two backports (8358529, 8373789) are clean.

Testing: GHA passed.

-------------

Commit messages:
 - 8373789: No PCH release build failure after JDK-8372543
 - 8372543: Shenandoah: undercalculated the available size when soft max takes effect
 - Backport fa32bfe11300fdadb35f083037f6ab2a8985d210

Changes: https://git.openjdk.org/jdk25u-dev/pull/132/files
  Webrev: https://webrevs.openjdk.org/?repo=jdk25u-dev&pr=132&range=00
  Issue: https://bugs.openjdk.org/browse/JDK-8358529
  Stats: 422 lines in 20 files changed: 230 ins; 94 del; 98 mod
  Patch: https://git.openjdk.org/jdk25u-dev/pull/132.diff
  Fetch: git fetch https://git.openjdk.org/jdk25u-dev.git pull/132/head:pull/132

PR: https://git.openjdk.org/jdk25u-dev/pull/132