[jdk17u-dev] RFR: 8297530: java.lang.IllegalArgumentException: Negative length on strings concatenation

[Victor Rudometov]

Backport for [JDK-8297530](https://bugs.openjdk.org/browse/JDK-8297530) java.lang.IllegalArgumentException: Negative length on strings concatenation

Clean backport, minor change
Tier1, Tier2, JCK Compiler, JCK Runtime passed
New test during run.

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Commit messages:
 - 8297530: java.lang.IllegalArgumentException: Negative length on strings concatenation

Changes: https://git.openjdk.org/jdk17u-dev/pull/940/files
 Webrev: https://webrevs.openjdk.org/?repo=jdk17u-dev&pr=940&range=00
  Issue: https://bugs.openjdk.org/browse/JDK-8297530
  Stats: 141 lines in 2 files changed: 139 ins; 0 del; 2 mod
  Patch: https://git.openjdk.org/jdk17u-dev/pull/940.diff
  Fetch: git fetch https://git.openjdk.org/jdk17u-dev pull/940/head:pull/940

PR: https://git.openjdk.org/jdk17u-dev/pull/940