RFR: 8374662: Remove unused type check functions from javaClasses.hpp

[Ioi Lam]

Please review this trivial patch.

These functions are never used and should be removed.

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Commit messages:
 - 8374662: Remove unused type check functions from javaClasses.hpp

Changes: https://git.openjdk.org/jdk/pull/29077/files
  Webrev: https://webrevs.openjdk.org/?repo=jdk&pr=29077&range=00
  Issue: https://bugs.openjdk.org/browse/JDK-8374662
  Stats: 24 lines in 2 files changed: 0 ins; 22 del; 2 mod
  Patch: https://git.openjdk.org/jdk/pull/29077.diff
  Fetch: git fetch https://git.openjdk.org/jdk.git pull/29077/head:pull/29077

PR: https://git.openjdk.org/jdk/pull/29077