RFR: Merge lworld

[Vicente Romero]

Please review this PR that is merging branch universal-tvars with lword.

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Commit messages:
 - Merge branch 'lworld' into universal-tvars_merge_lworld_17_19
 - 8269578: [lworld] fix AArch64 build after JDK-8267824
 - 8269792: [lworld] Duplicate/redundant CONSTANT_Class_info entry in constant pool
 - 8269274: [lworld] Withfield instruction fails to verify when operand stack contains LPrimitiveClass;
 - 8268021: [lworld] [AArch64] fix support for InlineTypeReturnedAsFields
 - Adjust testing
 - 8269279: [lworld] 8269231 causes build failures
 - 8269231: Fix 32-bit Valhalla (Zero) builds
 - 8269172: Add java.util.Objects.newIdentity method
 - 8269095: Fix Valhalla Zero build failures
 - ... and 639 more: https://git.openjdk.java.net/valhalla/compare/e8e33390...8d70bcbc

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

Changes: https://git.openjdk.java.net/valhalla/pull/473/files
  Stats: 630379 lines in 5662 files changed: 526985 ins; 80263 del; 23131 mod
  Patch: https://git.openjdk.java.net/valhalla/pull/473.diff
  Fetch: git fetch https://git.openjdk.java.net/valhalla pull/473/head:pull/473

PR: https://git.openjdk.java.net/valhalla/pull/473