[jdk21u-dev] RFR: 8317809: Insertion of free code blobs into code cache can be very slow during class unloading

[Goetz Lindenmaier]

Big change, but only two resolves needed:

src/hotspot/share/gc/g1/g1ConcurrentMark.cpp
The context differs because "8309538: G1: Move total collection increment from Cleanup to Remark"
is only in 22

src/hotspot/share/gc/serial/genMarkSweep.cpp
Resolved adding an #include.

SAP nightly testing passed.

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Commit messages:
 - Merge branch 'openjdk:master' into goetz_backport_8317809-keep
 - Merge branch 'openjdk:master' into goetz_backport_8317809-keep
 - Resolved hunks
 - Backport 30817b742300f10f566e6aee3a8c1f8af4ab3083

Changes: https://git.openjdk.org/jdk21u-dev/pull/505/files
  Webrev: https://webrevs.openjdk.org/?repo=jdk21u-dev&pr=505&range=00
  Issue: https://bugs.openjdk.org/browse/JDK-8317809
  Stats: 483 lines in 28 files changed: 352 ins; 87 del; 44 mod
  Patch: https://git.openjdk.org/jdk21u-dev/pull/505.diff
  Fetch: git fetch https://git.openjdk.org/jdk21u-dev.git pull/505/head:pull/505

PR: https://git.openjdk.org/jdk21u-dev/pull/505