RFR: 8367129: Move input validation checks to Java for java.lang.StringLatin1 intrinsics

[Volkan Yazici]

Moves input validation checks to Java for `java.lang.StringLatin1` intrinsics. While doing so, affected `java.lang.StringUTF16` methods needed to be updated due to relaxed checks at intrinsics. The javadocs of the touched methods are extensively overhauled.

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Commit messages:
 - More doc updates
 - Reflect that `VerifyIntrinsicChecks` is removed
 - Merge remote-tracking branch 'upstream/master' into sLatin1Intr
 - Fix `Helper`
 - Guard `equals` intrinsic
 - Cosmetic improvements
 - Guard `indexOf` intrinsics
 - Document `StringLatin1`
 - Guard `inflate`/`compress` intrinsics
 - Guard `compareTo` intrinsics

Changes: https://git.openjdk.org/jdk/pull/28832/files
  Webrev: https://webrevs.openjdk.org/?repo=jdk&pr=28832&range=00
  Issue: https://bugs.openjdk.org/browse/JDK-8367129
  Stats: 554 lines in 5 files changed: 457 ins; 16 del; 81 mod
  Patch: https://git.openjdk.org/jdk/pull/28832.diff
  Fetch: git fetch https://git.openjdk.org/jdk.git pull/28832/head:pull/28832

PR: https://git.openjdk.org/jdk/pull/28832