[jdk21u-dev] RFR: 8319650: Improve heap dump performance with class metadata caching

[Aleksey Shipilev]

Transplanted from https://github.com/openjdk/jdk21u/pull/388

Unclean backport to improve heap dump performance. The uncleanliness comes from [JDK-8306441](https://bugs.openjdk.org/browse/JDK-8306441) that does not exist in JDK 21, and which I don't think we want to backport at the moment. I had to add a few more `ResourceMark`-s near `HeapDumpWriter` to manage the cache allocations.

Additional testing:
 - [x] MacOS AArch64 server release, heap dump performance improved
 - [x]  Linux x86_64 server fastdebug, serviceability/ (contains heap dump tests)
 - [x] Linux x86_64 server fastdebug, runtime/ErrorHandling (contains heap dump on failure tests)
 - [x] Linux x86_64 server fastdebug, gc/epsilon (contains heap dump on failure tests)
 - [x] Linux x86_64 server fastdebug, sun/tools/jhsdb (contains heap dump tests)

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Commit messages:
 - Backport 03db82818b905f21cb5ad1d56a687e238b4a6e33

Changes: https://git.openjdk.org/jdk21u-dev/pull/8/files
 Webrev: https://webrevs.openjdk.org/?repo=jdk21u-dev&pr=8&range=00
  Issue: https://bugs.openjdk.org/browse/JDK-8319650
  Stats: 138 lines in 1 file changed: 114 ins; 5 del; 19 mod
  Patch: https://git.openjdk.org/jdk21u-dev/pull/8.diff
  Fetch: git fetch https://git.openjdk.org/jdk21u-dev.git pull/8/head:pull/8

PR: https://git.openjdk.org/jdk21u-dev/pull/8