[jdk11u-dev] RFR: 8255274: [PPC64, s390] wrong StringLatin1.indexOf version matched

[Dmitry Chuyko]

This is a follow-up to https://github.com/openjdk/jdk11u-dev/pull/41
Original patch applies cleanly on master.

-------------

Commit messages:
 - [PATCH] Backport df792573e8f6f7dff8f39469b0edaaa8f03715ce

Changes: https://git.openjdk.java.net/jdk11u-dev/pull/43/files
 Webrev: https://webrevs.openjdk.java.net/?repo=jdk11u-dev&pr=43&range=00
  Issue: https://bugs.openjdk.java.net/browse/JDK-8255274
  Stats: 38 lines in 2 files changed: 36 ins; 0 del; 2 mod
  Patch: https://git.openjdk.java.net/jdk11u-dev/pull/43.diff
  Fetch: git fetch https://git.openjdk.java.net/jdk11u-dev pull/43/head:pull/43

PR: https://git.openjdk.java.net/jdk11u-dev/pull/43