RFR: 8316628: [lw5] remove vnew, aconst_init, and withfield

[Vicente Romero]

This PR is removing bytecods vnew, aconst_init, and withfield. Some tests will have to be ignored as for them to pass some changes need to be made to the verifier which still expects value classes to have factory methods (vnew)

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Commit messages:
 - Merge branch 'lw5' into JDK-8316628
 - 8316628: [lw5] remove vnew, aconst_init, and withfield

Changes: https://git.openjdk.org/valhalla/pull/934/files
 Webrev: https://webrevs.openjdk.org/?repo=valhalla&pr=934&range=00
  Issue: https://bugs.openjdk.org/browse/JDK-8316628
  Stats: 1071 lines in 44 files changed: 1 ins; 944 del; 126 mod
  Patch: https://git.openjdk.org/valhalla/pull/934.diff
  Fetch: git fetch https://git.openjdk.org/valhalla.git pull/934/head:pull/934

PR: https://git.openjdk.org/valhalla/pull/934