RFR: 8328592: hprof tests fail with -XX:-CompactStrings [v2]

[Aleksey Shipilev]

> See the bug for symptoms. The tests are failing because hprof test library is confused about non-compact strings.
> 
> Additional testing:
>  - [x] `serviceability/HeapDump lib-test:all` with `-XX:-CompactStrings` now pass
>  - [x]  `serviceability/HeapDump lib-test:all` with `-XX:+CompactStrings` still pass

Aleksey Shipilev has updated the pull request with a new target base due to a merge or a rebase. The incremental webrev excludes the unrelated changes brought in by the merge/rebase. The pull request contains three additional commits since the last revision:

 - Handle platform endianness better
 - Merge branch 'master' into JDK-8328592-hprof-compact-strings
 - Fix

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

Changes:
  - all: https://git.openjdk.org/jdk/pull/18394/files
  - new: https://git.openjdk.org/jdk/pull/18394/files/5ba1f4b8..f783418d

Webrevs:
 - full: https://webrevs.openjdk.org/?repo=jdk&pr=18394&range=01
 - incr: https://webrevs.openjdk.org/?repo=jdk&pr=18394&range=00-01

  Stats: 292803 lines in 402 files changed: 5222 ins; 5761 del; 281820 mod
  Patch: https://git.openjdk.org/jdk/pull/18394.diff
  Fetch: git fetch https://git.openjdk.org/jdk.git pull/18394/head:pull/18394

PR: https://git.openjdk.org/jdk/pull/18394