[jdk21u-dev] RFR: 8315891: java/foreign/TestLinker.java failed with "error occurred while instantiating class TestLinker: null"

[Aleksey Shipilev]

Clean backport to allow fallback linker to work under SecurityManager. Makes [JDK-8318737](https://bugs.openjdk.org/browse/JDK-8318737) backport clean.

Additional testing:
 - [x] macos-aarch64-server-fastdebug, `java/foreign` passes

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Commit messages:
 - Backport a62c48b87e814b5b1f4c8089f9ff354156f92f69

Changes: https://git.openjdk.org/jdk21u-dev/pull/260/files
 Webrev: https://webrevs.openjdk.org/?repo=jdk21u-dev&pr=260&range=00
  Issue: https://bugs.openjdk.org/browse/JDK-8315891
  Stats: 13 lines in 1 file changed: 6 ins; 0 del; 7 mod
  Patch: https://git.openjdk.org/jdk21u-dev/pull/260.diff
  Fetch: git fetch https://git.openjdk.org/jdk21u-dev.git pull/260/head:pull/260

PR: https://git.openjdk.org/jdk21u-dev/pull/260