[lworld] RFR: Merge jdk

[David Simms]

Merge tag 'jdk-26+18' into lworld_merge_jdk_26_18

Added tag jdk-26+18 for changeset 5251405c

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Commit messages:
 - Merge jdk
 - 8368848: JShell's code completion not always working for multi-snippet inputs
 - 8338197: [ubsan] ad_x86.hpp:6417:11: runtime error: shift exponent 100 is too large for 32-bit type 'unsigned int'
 - 8368698: runtime/cds/appcds/aotCache/OldClassSupport.java assert(can_add()) failed: Cannot add TrainingData objects
 - 8368968: FloatingDecimal: Clean up unused code
 - 8368985: Small Float16 refactorings
 - 6177299: [Fmt-Nu] NumberFormat.getPercentInstance() does not work correctly
 - 8367704: Fix minor documentation issues in java.time.**
 - 8368938: Remove ObjectWaiter::badObjectWaiterPtr
 - 8368675: IGV: nodes are wrongly marked as changed in the difference view
 - ... and 93 more: https://git.openjdk.org/valhalla/compare/8845b6ae...85298c19

The webrevs contain the adjustments done while merging with regards to each parent branch:
 - lworld: https://webrevs.openjdk.org/?repo=valhalla&pr=1696&range=00.0
 - jdk: https://webrevs.openjdk.org/?repo=valhalla&pr=1696&range=00.1

Changes: https://git.openjdk.org/valhalla/pull/1696/files
  Stats: 11980 lines in 391 files changed: 6399 ins; 3203 del; 2378 mod
  Patch: https://git.openjdk.org/valhalla/pull/1696.diff
  Fetch: git fetch https://git.openjdk.org/valhalla.git pull/1696/head:pull/1696

PR: https://git.openjdk.org/valhalla/pull/1696