[jdk17u-dev] RFR: 8286331: jni_GetStringUTFChars() uses wrong heap allocator [v2]

[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.

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

Webrevs:
 - full: https://webrevs.openjdk.org/?repo=jdk17u-dev&pr=1401&range=01
 - incr: https://webrevs.openjdk.org/?repo=jdk17u-dev&pr=1401&range=00-01

  Stats: 0 lines in 0 files changed: 0 ins; 0 del; 0 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