Integrated: Merge lworld

[Vicente Romero]

Merge branch 'lworld' into bworld_merge_lworld
# Conflicts:
#	test/jdk/valhalla/valuetypes/NullRestrictedTest.java
#	test/langtools/tools/javac/valhalla/value-objects/ValueObjectCompilationTests.java

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Commit messages:
 - Merge branch 'lworld' into bworld_merge_lworld
 - 8374959: [lworld] runtime/cds/appcds/cacheObject/ArchivedIntegerCacheTest.java fails with --enable-preview
 - 8375777: [lworld] jdk/javadoc/doccheck/checks/jdkCheckLinks.java failed with missing ids
 - 8372599: [lworld] runtime/cds/serviceability/ReplaceCriticalClassesForSubgraphs.java fails with --enable-preview
 - 8376171: [lworld] Enable storing the hash code in the mark word of value objects
 - 8376512: [lworld] Value objects should consistently use System.identityHashCode
 - 8376122: [lworld] Cleanup of SA use of aconst_init and withfield
 - 8374786: [lworld] C2: Missing asserts in parse3.cpp after merging JDK-8341411
 - 8376430: [lworld] Remove Modifier.IDENTITY
 - 8375074: [lworld] vmTestbase/nsk/jdi/ModificationWatchpointEvent/valueToBe/valuetobe001/TestDescription.java fails with --enable-preview
 - ... and 12 more: https://git.openjdk.org/valhalla/compare/1702fdfd...16e7ed1f

The webrevs contain the adjustments done while merging with regards to each parent branch:
 - bworld: https://webrevs.openjdk.org/?repo=valhalla&pr=1996&range=00.0
 - lworld: https://webrevs.openjdk.org/?repo=valhalla&pr=1996&range=00.1

Changes: https://git.openjdk.org/valhalla/pull/1996/files
  Stats: 2455 lines in 130 files changed: 1638 ins; 357 del; 460 mod
  Patch: https://git.openjdk.org/valhalla/pull/1996.diff
  Fetch: git fetch https://git.openjdk.org/valhalla.git pull/1996/head:pull/1996

PR: https://git.openjdk.org/valhalla/pull/1996