[lworld] RFR: Merge jdk

[David Simms]

Merge jdk-18+18

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Commit messages:
 - Merge error
 - Merge tag 'jdk-18+18' into lworld_merge_jdk_20210921
 - 8274318: Replace 'for' cycles with iterator with enhanced-for in java.management
 - 8274525: Replace uses of StringBuffer with StringBuilder in java.xml
 - 8273711: Remove redundant stream() call before forEach in jdk.jlink
 - 8274464: Remove redundant stream() call before forEach in java.* modules
 - 8262944: Improve exception message when automatic module lists provider class not in JAR file
 - 8273917: Remove 'leaf' ranking for Mutex
 - 8273381: Assert in PtrQueueBufferAllocatorTest.stress_free_list_allocator_vm
 - 8274496: Use String.contains() instead of String.indexOf() in java.desktop
 - ... and 505 more: https://git.openjdk.java.net/valhalla/compare/3f5d92fb...216bef67

The webrevs contain the adjustments done while merging with regards to each parent branch:
 - lworld: https://webrevs.openjdk.java.net/?repo=valhalla&pr=559&range=00.0
 - jdk: https://webrevs.openjdk.java.net/?repo=valhalla&pr=559&range=00.1

Changes: https://git.openjdk.java.net/valhalla/pull/559/files
  Stats: 60525 lines in 1999 files changed: 38976 ins; 11572 del; 9977 mod
  Patch: https://git.openjdk.java.net/valhalla/pull/559.diff
  Fetch: git fetch https://git.openjdk.java.net/valhalla pull/559/head:pull/559

PR: https://git.openjdk.java.net/valhalla/pull/559