[lworld] RFR: Merge jdk

[David Simms]

Merge jdk-27+3

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Commit messages:
 - Adjust testing
 - Avoid JDK-8374116
 - Avoid JDK-8374115
 - Merge tag 'jdk-27+3' into lworld_merge_jdk_27_3
 - 8373820: C2: Robust Node::uncast_helper infinite loop check
 - 8373866: Refactor java/net/httpclient/ThrowingSubscribers*.java tests to use JUnit5
 - 8373796: Refactor java/net/httpclient/ThrowingPublishers*.java tests to use JUnit5
 - 8373869: Refactor java/net/httpclient/ThrowingPushPromises*.java tests to use JUnit5
 - 8372348: Adjust some UL / JFR string deduplication output messages
 - 8373593: Support latest  VS2026 MSC_VER in abstract_vm_version.cpp
 - ... and 104 more: https://git.openjdk.org/valhalla/compare/69399ced...f115026d

The webrevs contain the adjustments done while merging with regards to each parent branch:
 - lworld: https://webrevs.openjdk.org/?repo=valhalla&pr=1843&range=00.0
 - jdk: https://webrevs.openjdk.org/?repo=valhalla&pr=1843&range=00.1

Changes: https://git.openjdk.org/valhalla/pull/1843/files
  Stats: 17311 lines in 650 files changed: 11141 ins; 2361 del; 3809 mod
  Patch: https://git.openjdk.org/valhalla/pull/1843.diff
  Fetch: git fetch https://git.openjdk.org/valhalla.git pull/1843/head:pull/1843

PR: https://git.openjdk.org/valhalla/pull/1843