[lworld] RFR: 8247569: [lworld] Align with spec for <vnew> methods [v2]

[David Simms]

> Merged javac and VM work together, includes VM support (JDK-8294224)

David Simms has updated the pull request with a new target base due to a merge or a rebase. The pull request now contains 26 commits:

 - Post 8281295: revert MethodAccessorGenerator, no longer needed
 - Merge branch 'lworld' into vnew_javac_hotspot
 - mchung: core-libs fixes
 - Fixes for valhalla/valuetypes/Serialization.java
 - Merge branch 'lworld' into vnew_javac_hotspot
 - MethodHandles.java aware of vnew, no longer static/non-static <init>
 - MethodHandles::resolve_MemberName for <vnew>
 - Merge pull request #2 from MrSimms/fixing.failing.regression.tests
   
   fixing failing regression tests
 - fixing failing regression tests
 - Merge branch 'vnew' into vnew_javac_hotspot
 - ... and 16 more: https://git.openjdk.org/valhalla/compare/688186b3...c9d2bb6d

-------------

Changes: https://git.openjdk.org/valhalla/pull/788/files
 Webrev: https://webrevs.openjdk.org/?repo=valhalla&pr=788&range=01
  Stats: 730 lines in 82 files changed: 319 ins; 103 del; 308 mod
  Patch: https://git.openjdk.org/valhalla/pull/788.diff
  Fetch: git fetch https://git.openjdk.org/valhalla pull/788/head:pull/788

PR: https://git.openjdk.org/valhalla/pull/788