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

[Aleksey Shipilev]

Clean backport to avoid accidental stack walk during `GetStringUTFChars`. Requires #1399 to be correct.

Additional testing:
 - [ ] Linux x86_64 fastdebug `tier1 tier2 tier3`

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Depends on: https://git.openjdk.org/jdk17u-dev/pull/1399

Commit messages:
 - Backport b0d2b0a3553cbb2db23d543b98ab1401b3dbfa91

Changes: https://git.openjdk.org/jdk17u-dev/pull/1401/files
 Webrev: https://webrevs.openjdk.org/?repo=jdk17u-dev&pr=1401&range=00
  Issue: https://bugs.openjdk.org/browse/JDK-8286331
  Stats: 3 lines in 2 files changed: 0 ins; 0 del; 3 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