[lworld] RFR: 8367564: Fields access in interpreter needs cleanup and refactoring

[Frederic Parain]

Remove dead code from [get|put][field|static] in the interpreter.
Interpreter code refactoring to remove code duplication and reduce number of tests at runtime.

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

Commit messages:
 - Interpreter fields access code cleanup and refactoring

Changes: https://git.openjdk.org/valhalla/pull/1583/files
  Webrev: https://webrevs.openjdk.org/?repo=valhalla&pr=1583&range=00
  Issue: https://bugs.openjdk.org/browse/JDK-8367564
  Stats: 362 lines in 11 files changed: 85 ins; 194 del; 83 mod
  Patch: https://git.openjdk.org/valhalla/pull/1583.diff
  Fetch: git fetch https://git.openjdk.org/valhalla.git pull/1583/head:pull/1583

PR: https://git.openjdk.org/valhalla/pull/1583