[lworld] RFR: 8293551: [lworld] Remove obsolete interfaces __primitive__ and __value__, and NonTearable

[Roger Riggs]

The java.lang interfaces __primitive__ and __value__ as well as java.lang.NonTearable are no longer needed for value objects.

The files are deleted and tests updated.

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Commit messages:
 - 8293551: [lworld] Remove obsolete interfaces __primitive__ and __value__, and NonTearable

Changes: https://git.openjdk.org/valhalla/pull/782/files
 Webrev: https://webrevs.openjdk.org/?repo=valhalla&pr=782&range=00
  Issue: https://bugs.openjdk.org/browse/JDK-8293551
  Stats: 152 lines in 6 files changed: 1 ins; 150 del; 1 mod
  Patch: https://git.openjdk.org/valhalla/pull/782.diff
  Fetch: git fetch https://git.openjdk.org/valhalla pull/782/head:pull/782

PR: https://git.openjdk.org/valhalla/pull/782