Integrated: Merge lworld

[Vicente Romero]

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

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Commit messages:
 - Merge branch 'lworld' into lw5_merge_lworld
 - Merge lworld
 - Merge lworld
 - 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
 - ... and 31 more: https://git.openjdk.org/valhalla/compare/1d120f32...e5d80220

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

Changes: https://git.openjdk.org/valhalla/pull/1016/files
  Stats: 8225 lines in 292 files changed: 4456 ins; 2611 del; 1158 mod
  Patch: https://git.openjdk.org/valhalla/pull/1016.diff
  Fetch: git fetch https://git.openjdk.org/valhalla.git pull/1016/head:pull/1016

PR: https://git.openjdk.org/valhalla/pull/1016