RFR: 8302590: Add String.indexOf(int ch, int fromIndex, int toIndex) [v2]

[Raffaello Giulietti]

> Add an `indexOf()` variant allowing to specify both a lower and an upper bound on the search.

Raffaello Giulietti has updated the pull request incrementally with one additional commit since the last revision:

  8302590: Add String.indexOf(int ch, int fromIndex, int toIndex)

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Changes:
  - all: https://git.openjdk.org/jdk/pull/12600/files
  - new: https://git.openjdk.org/jdk/pull/12600/files/5e6aedac..fdb39c47

Webrevs:
 - full: https://webrevs.openjdk.org/?repo=jdk&pr=12600&range=01
 - incr: https://webrevs.openjdk.org/?repo=jdk&pr=12600&range=00-01

  Stats: 20 lines in 3 files changed: 9 ins; 0 del; 11 mod
  Patch: https://git.openjdk.org/jdk/pull/12600.diff
  Fetch: git fetch https://git.openjdk.org/jdk pull/12600/head:pull/12600

PR: https://git.openjdk.org/jdk/pull/12600