RFR: Merge bworld

[Chen Liang]

Merge the JVM parsing of ACC_NULL_CHECKED and the bang fix for native/abstract methods.

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Commit messages:
 - Merge branch 'bworld' of https://github.com/openjdk/valhalla into bworld-apis-merge
 - Merge lworld
 - 8376103: [lworld] Basic Zero support
 - 8367935: [lworld] Rename ACC_STRICT in the JVM according to strict fields JEP
 - 8366270: [lworld] Fix ClassFile AccessFlagsTest
 - 8373375: [lworld] Remove Unsafe.make/finishPrivateBuffer
 - 8376213: [lworld] C2: assert(is_InlineType()) failed: invalid node class: Phi/LoadP/DecodeN
 - 8376733: [lworld] Inconsistent result of Invoke::declared_type triggers assert in profiling
 - [bworld] fixing regression tests
 - [bworld] javac crash for abstract methods with null restricted arguments
 - ... and 7 more: https://git.openjdk.org/valhalla/compare/013c6aef...06efd5a4

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

Changes: https://git.openjdk.org/valhalla/pull/2053/files
  Stats: 1049 lines in 69 files changed: 326 ins; 504 del; 219 mod
  Patch: https://git.openjdk.org/valhalla/pull/2053.diff
  Fetch: git fetch https://git.openjdk.org/valhalla.git pull/2053/head:pull/2053

PR: https://git.openjdk.org/valhalla/pull/2053