git: openjdk/jdk21u: master: 8317692: jcmd GC.heap_dump performance regression after JDK-8292818

[Aleksey Shipilev]

Changeset: c5a6a74a
Author:    Hannes Greule <hgreule at openjdk.org>
Committer: Aleksey Shipilev <shade at openjdk.org>
Date:      2023-10-26 07:35:56 +0000
URL:       https://git.openjdk.org/jdk21u/commit/c5a6a74a2ffb069f3b732c90b7e029c095c2da1f

8317692: jcmd GC.heap_dump performance regression after JDK-8292818

Backport-of: 8f5f44070a7c6dbbbd1005f9d0af5ab7c35179df

! src/hotspot/share/oops/fieldStreams.hpp
! src/hotspot/share/services/heapDumper.cpp
+ test/hotspot/jtreg/serviceability/HeapDump/FieldsInInstanceTest.java