[jdk19] RFR: 8289601: SegmentAllocator::allocateUtf8String(String str) should be clarified for strings containing \0

Mon Jul 4 13:26:53 UTC 2022

This PR updates the spec and implementation to throw an `IllegalArgumentException` when an attempt is made to convert a Java string containing null characters to a C string.

Testing: local run of the `jdk_foreign` test suite.

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Commit messages:
 - Throw IAE when converting string with null byte.

Changes: https://git.openjdk.org/jdk19/pull/107/files
 Webrev: https://webrevs.openjdk.org/?repo=jdk19&pr=107&range=00
  Issue: https://bugs.openjdk.org/browse/JDK-8289601
  Stats: 32 lines in 3 files changed: 25 ins; 6 del; 1 mod
  Patch: https://git.openjdk.org/jdk19/pull/107.diff
  Fetch: git fetch https://git.openjdk.org/jdk19 pull/107/head:pull/107

PR: https://git.openjdk.org/jdk19/pull/107