RFR: 8350811: [JMH] test foreign.StrLenTest failed with StringIndexOutOfBoundsException for size=451

[Vladimir Ivanov]

test setup was updated to generate data of requested size.

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Commit messages:
 - JDK-8350811 [JMH] test foreign.StrLenTest failed with StringIndexOutOfBoundsException for size=451

Changes: https://git.openjdk.org/jdk/pull/23873/files
  Webrev: https://webrevs.openjdk.org/?repo=jdk&pr=23873&range=00
  Issue: https://bugs.openjdk.org/browse/JDK-8350811
  Stats: 15 lines in 3 files changed: 10 ins; 0 del; 5 mod
  Patch: https://git.openjdk.org/jdk/pull/23873.diff
  Fetch: git fetch https://git.openjdk.org/jdk.git pull/23873/head:pull/23873

PR: https://git.openjdk.org/jdk/pull/23873