Integrated: Merge lworld

[Vicente Romero]

Merge branch 'lworld' into lw5_merge_lworld

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Commit messages:
 - Merge branch 'lworld' into lw5_merge_lworld
 - 8336782: [lworld] CallStaticJavaNode::remove_useless_allocation does not handle dying subgraph
 - 8336842: [lworld] Return value buffering in TLAB does not work with -XX:FastAllocateSizeLimit=0
 - 8326605: [lworld] SplitIfSharedFastLockBehindCastPP performs synchronization on a value class

The merge commit only contains trivial merges, so no merge-specific webrevs have been generated.

Changes: https://git.openjdk.org/valhalla/pull/1216/files
  Stats: 56 lines in 5 files changed: 17 ins; 6 del; 33 mod
  Patch: https://git.openjdk.org/valhalla/pull/1216.diff
  Fetch: git fetch https://git.openjdk.org/valhalla.git pull/1216/head:pull/1216

PR: https://git.openjdk.org/valhalla/pull/1216