Integrated: Merge lworld

[Vicente Romero]

Merge branch 'lworld' into lw5_merge_lworld
# Conflicts:
#	src/jdk.compiler/share/classes/com/sun/tools/javac/jvm/ClassReader.java

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Commit messages:
 - Merge branch 'lworld' into lw5_merge_lworld
 - 8373670: [lworld] Relax jcheck checks
 - Merge
 - Merge
 - Merge lworld
 - Merge lworld
 - Merge lworld
 - 8347754: [lw5] fix the order of nullness markers in signatures
 - Merge lworld
 - Merge lworld
 - ... and 62 more: https://git.openjdk.org/valhalla/compare/619ef43b...cb9ca633

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

Changes: https://git.openjdk.org/valhalla/pull/1814/files
  Stats: 6804 lines in 102 files changed: 6680 ins; 2 del; 122 mod
  Patch: https://git.openjdk.org/valhalla/pull/1814.diff
  Fetch: git fetch https://git.openjdk.org/valhalla.git pull/1814/head:pull/1814

PR: https://git.openjdk.org/valhalla/pull/1814