[lworld] RFR: 8287692: Move Class primitive APIs to jdk.internal.value.PrimitiveClass

[Roger Riggs]

Move Class primitive APIs to jdk.internal.value.PrimitiveClass.

Update hotspot tests to use PrimitiveClass instead of Class.xxx methods.
Add imports of jdk.internal.value.PrimitiveClass
Add --add-exports java.base/jdk.internal.value=ALL-UNNAMED

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Commit messages:
 - 8287692: Move Class primitive APIs to jdk.internal.value.PrimitiveClass

Changes: https://git.openjdk.org/valhalla/pull/752/files
 Webrev: https://webrevs.openjdk.org/?repo=valhalla&pr=752&range=00
  Issue: https://bugs.openjdk.org/browse/JDK-8287692
  Stats: 758 lines in 79 files changed: 350 ins; 19 del; 389 mod
  Patch: https://git.openjdk.org/valhalla/pull/752.diff
  Fetch: git fetch https://git.openjdk.org/valhalla pull/752/head:pull/752

PR: https://git.openjdk.org/valhalla/pull/752