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

[David Simms]

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

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Commit messages:
 - 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
 - Merge branch 'vnew' into vnew_javac_hotspot
 - Compile issue
 - Adjust hotspot_valhalla tests
 - Abstract value class constructor is vanilla <init>
 - ... and 13 more: https://git.openjdk.org/valhalla/compare/cf05d5c1...953c2060

Changes: https://git.openjdk.org/valhalla/pull/788/files
 Webrev: https://webrevs.openjdk.org/?repo=valhalla&pr=788&range=00
  Issue: https://bugs.openjdk.org/browse/JDK-8247569
  Stats: 667 lines in 81 files changed: 270 ins; 94 del; 303 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