[lworld] RFR: Merge jdk

[David Simms]

Merge tag 'jdk-26+20' into lworld_merge_jdk_26_20

Added tag jdk-26+20 for changeset b5b83247

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Commit messages:
 - Merge jdk
 - 8369656: Calling CompletableFuture.join() could execute task in common pool
 - 8369683: Exclude runtime/Monitor/MonitorWithDeadObjectTest.java#DumpThreadsBeforeDetach on Alpine Linux debug
 - 8369258: C2: enable ReassociateInvariants for all loop types
 - 8365609: Fix several potential NULL native pointer dereferences in the desktop module
 - 8369167: C2: refactor LShiftINode/LShiftLNode Value/Identity/Ideal
 - 8369881: C2: Unexpected node in SuperWord truncation: ReverseBytesS, ReverseBytesUS
 - 8357809: Test jdk/jshell/JdiListeningExecutionControlTest.java failed with com.sun.jdi.connect.TransportTimeoutException
 - 8368940: Missing ResourceMark when stalling for shutdown
 - 8369251: Opensource few tests
 - ... and 98 more: https://git.openjdk.org/valhalla/compare/c447cf3c...c937a38d

The webrevs contain the adjustments done while merging with regards to each parent branch:
 - lworld: https://webrevs.openjdk.org/?repo=valhalla&pr=1703&range=00.0
 - jdk: https://webrevs.openjdk.org/?repo=valhalla&pr=1703&range=00.1

Changes: https://git.openjdk.org/valhalla/pull/1703/files
  Stats: 19009 lines in 404 files changed: 11702 ins; 6259 del; 1048 mod
  Patch: https://git.openjdk.org/valhalla/pull/1703.diff
  Fetch: git fetch https://git.openjdk.org/valhalla.git pull/1703/head:pull/1703

PR: https://git.openjdk.org/valhalla/pull/1703