Integrated: 8267597: [lworld] Withdraw all support for bifurcated class generation for primitive classes

[Srikanth Adayapalam]

Adjust code generation and tests to the new unified world view

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Commit messages:
 - 8267597: Withdraw all support for bifurcated class generation for primitive classes

Changes: https://git.openjdk.java.net/valhalla/pull/441/files
 Webrev: https://webrevs.openjdk.java.net/?repo=valhalla&pr=441&range=00
  Issue: https://bugs.openjdk.java.net/browse/JDK-8267597
  Stats: 805 lines in 27 files changed: 3 ins; 738 del; 64 mod
  Patch: https://git.openjdk.java.net/valhalla/pull/441.diff
  Fetch: git fetch https://git.openjdk.java.net/valhalla pull/441/head:pull/441

PR: https://git.openjdk.java.net/valhalla/pull/441