RFR: Merge jdk16

[Jesper Wilhelmsson]

Forwardport JDK 16 -> JDK 17

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Commit messages:
 - Merge
 - 8260370: C2: LoopLimit node is not eliminated

The webrevs contain the adjustments done while merging with regards to each parent branch:
 - master: https://webrevs.openjdk.java.net/?repo=jdk&pr=2276&range=00.0
 - jdk16: https://webrevs.openjdk.java.net/?repo=jdk&pr=2276&range=00.1

Changes: https://git.openjdk.java.net/jdk/pull/2276/files
  Stats: 9 lines in 2 files changed: 8 ins; 0 del; 1 mod
  Patch: https://git.openjdk.java.net/jdk/pull/2276.diff
  Fetch: git fetch https://git.openjdk.java.net/jdk pull/2276/head:pull/2276

PR: https://git.openjdk.java.net/jdk/pull/2276