[lworld] RFR: Merge jdk

[David Simms]

Merge jdk-15+25

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Commit messages:
 - Whitespace
 - Merge tag 'jdk-15+25' into lworld_merge_jdk_15_25
 - 8244504: C2: refactor counted loop code in preparation for long counted loop
 - 8230827: javac gives inappropriate warning about potentially ambiguous methods
 - 8245786: Scope is wrong for ClassTree representing record
 - 8246027: Minimal fastdebug build broken after JDK-8245801
 - 8246034: Remove java.base/share/classes/jdk/internal/jrtfs/jrtfsviewer.js and java.base/share/classes/jdk/internal/jrtfs/jrtls.js
 - 8243936: NonWriteable system properties are actually writeable
 - Added tag jdk-15+25 for changeset 588330449887
 - 8245062: HtmlStyle: group and document members for nav, header, summary, details
 - ... and 93 more: https://git.openjdk.java.net/valhalla/compare/8e358382...163ddcfe

The webrevs contain the adjustments done while merging with regards to each parent branch:
 - lworld: https://webrevs.openjdk.java.net/valhalla/74/webrev.00.0
 - jdk: https://webrevs.openjdk.java.net/valhalla/74/webrev.00.1

Changes: https://git.openjdk.java.net/valhalla/pull/74/files
  Stats: 262067 lines in 2260 files changed: 60631 ins; 194439 del; 6997 mod
  Patch: https://git.openjdk.java.net/valhalla/pull/74.diff
  Fetch: git fetch https://git.openjdk.java.net/valhalla pull/74/head:pull/74

PR: https://git.openjdk.java.net/valhalla/pull/74