[lworld] RFR: 8326719: [lworld] Migrate core-libs support to JEP 401 (part 1)

[Mandy Chung]

This patch includes:
- Removal of support for secondary mirror
- Removal of support for primitive classes
- Removal of support for value factories 
- Removal of the intrinsic methods `Class::asPrimitiveType` and `asValueType`

This patch includes a temporary fix of `Class::isValue` which will be replaced by #1019.

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Commit messages:
 - 8326719: [lworld] Migrate core-libs support to JEP 401 (part 1)

Changes: https://git.openjdk.org/valhalla/pull/1020/files
 Webrev: https://webrevs.openjdk.org/?repo=valhalla&pr=1020&range=00
  Issue: https://bugs.openjdk.org/browse/JDK-8326719
  Stats: 818 lines in 42 files changed: 3 ins; 738 del; 77 mod
  Patch: https://git.openjdk.org/valhalla/pull/1020.diff
  Fetch: git fetch https://git.openjdk.org/valhalla.git pull/1020/head:pull/1020

PR: https://git.openjdk.org/valhalla/pull/1020