RFR: Merge lworld

[Vicente Romero]

Merge branch 'lworld' into bworld_merge_lworld
# Conflicts:
#	test/hotspot/jtreg/compiler/valhalla/inlinetypes/TestArrays.java
#	test/hotspot/jtreg/runtime/valhalla/inlinetypes/FlattenableSemanticTest.java
#	test/jdk/valhalla/valuetypes/MethodHandleTest.java
#	test/jdk/valhalla/valuetypes/NullRestrictedTest.java
#	test/jdk/valhalla/valuetypes/ValueObjectMethodsTest.java

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Commit messages:
 - Merge branch 'lworld' into bworld_merge_lworld
 - 8376135: [lworld] Add JIT support for NULLABLE_NON_ATOMIC_FLAT layout
 - 8376890: [lworld] Compiler replay crashes when class cannot be loaded after JDK-8375548
 - 8372745: [lworld] Fatal error in native method when running java/foreign/sharedclosejvmti/TestSharedCloseJvmti.java with --enable-preview
 - 8376815: [lworld] compiler/valhalla/inlinetypes/TestTrivialMethods.java still fails after JDK-8373692
 - 8376752: [lworld] clarify/organize Valhalla ProblemLists
 - 8376528: [lworld] value class creation in CompileJavaModules.gmk leaves unnecessary files
 - 8376046: [lworld] Adjust @NullRestricted tests to remove @Strict
 - 8376825: [lworld] Remove duplicate asmtools from test/lib
 - 8376827: [lworld] fix typo in ProblemListing for JDK-8376815
 - ... and 6 more: https://git.openjdk.org/valhalla/compare/187ac64b...99688b82

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

Changes: https://git.openjdk.org/valhalla/pull/2015/files
  Stats: 27673 lines in 255 files changed: 701 ins; 26720 del; 252 mod
  Patch: https://git.openjdk.org/valhalla/pull/2015.diff
  Fetch: git fetch https://git.openjdk.org/valhalla.git pull/2015/head:pull/2015

PR: https://git.openjdk.org/valhalla/pull/2015