RFR: 8316628: [lw5] remove vnew, aconst_init, and withfield [v3]

[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)

Vicente Romero has updated the pull request incrementally with one additional commit since the last revision:

  minor change to jvm.ClassWriter

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Changes:
  - all: https://git.openjdk.org/valhalla/pull/934/files
  - new: https://git.openjdk.org/valhalla/pull/934/files/9681a053..513928d8

Webrevs:
 - full: https://webrevs.openjdk.org/?repo=valhalla&pr=934&range=02
 - incr: https://webrevs.openjdk.org/?repo=valhalla&pr=934&range=01-02

  Stats: 1 line in 1 file changed: 0 ins; 0 del; 1 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