[jdk17u-dev] RFR: 8286331: jni_GetStringUTFChars() uses wrong heap allocator [v3]

[Aleksey Shipilev]

> Clean backport to avoid accidental stack walk during `GetStringUTFChars`. Requires #1399 to be correct.
> 
> Additional testing:
>  - [x] Linux x86_64 fastdebug `tier1 tier2 tier3`

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:

 - Merge branch 'master' into JDK-8286331-jni-getstringutfchars-wrongheapalloc
 - Backport b0d2b0a3553cbb2db23d543b98ab1401b3dbfa91
 - Backport 64b05ccbed7879dd38a49453a6098bfe9729ee76

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

Changes:
  - all: https://git.openjdk.org/jdk17u-dev/pull/1401/files
  - new: https://git.openjdk.org/jdk17u-dev/pull/1401/files/263ed82f..9e760fd1

Webrevs:
 - full: https://webrevs.openjdk.org/?repo=jdk17u-dev&pr=1401&range=02
 - incr: https://webrevs.openjdk.org/?repo=jdk17u-dev&pr=1401&range=01-02

  Stats: 1878 lines in 17 files changed: 1840 ins; 4 del; 34 mod
  Patch: https://git.openjdk.org/jdk17u-dev/pull/1401.diff
  Fetch: git fetch https://git.openjdk.org/jdk17u-dev.git pull/1401/head:pull/1401

PR: https://git.openjdk.org/jdk17u-dev/pull/1401