[jdk17u-dev] RFR: 8299671: Speed up compiler/intrinsics/string/TestStringLatin1IndexOfChar.java

[Goetz Lindenmaier]

I backport this for parity with 17.0.7-oracle.

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Commit messages:
 - Backport d2827ec8f77020241fee7d613fb7cf081b455eb9

Changes: https://git.openjdk.org/jdk17u-dev/pull/1163/files
 Webrev: https://webrevs.openjdk.org/?repo=jdk17u-dev&pr=1163&range=00
  Issue: https://bugs.openjdk.org/browse/JDK-8299671
  Stats: 41 lines in 1 file changed: 33 ins; 0 del; 8 mod
  Patch: https://git.openjdk.org/jdk17u-dev/pull/1163.diff
  Fetch: git fetch https://git.openjdk.org/jdk17u-dev pull/1163/head:pull/1163

PR: https://git.openjdk.org/jdk17u-dev/pull/1163