Integrated: Merge lworld

[Vicente Romero]

Merge branch 'lworld' into lw5_merge_lworld
# Conflicts:
#	src/jdk.jdeps/share/classes/com/sun/tools/javap/AttributeWriter.java

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Commit messages:
 - Merge branch 'lworld' into lw5_merge_lworld
 - Merge lworld
 - Merge lworld
 - Merge lworld
 - Merge lworld
 - 8318117: [lw5] create a switch for null-restricted types
 - 8316628: [lw5] remove vnew, aconst_init, and withfield
 - Merge lworld
 - 8316561: [lw5] class file attribute NullRestricted shouldn't be generated for arrays
 - 8316325: [lw5] sync javac with the current JVMS, particularly assertions on new class attributes
 - ... and 28 more: https://git.openjdk.org/valhalla/compare/df2362fc...c091d270

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

Changes: https://git.openjdk.org/valhalla/pull/971/files
  Stats: 8226 lines in 292 files changed: 4455 ins; 2614 del; 1157 mod
  Patch: https://git.openjdk.org/valhalla/pull/971.diff
  Fetch: git fetch https://git.openjdk.org/valhalla.git pull/971/head:pull/971

PR: https://git.openjdk.org/valhalla/pull/971