RFR: 8364319: Move java.lang.constant.AsTypeMethodHandleDesc to jdk.internal

[Chen Liang]

java.lang.constant.AsTypeMethodHandleDesc is an implementation class for the Constant API. It was omitted in the move probably because its name does not end with Impl. We should move it to the implementation package instead.

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Commit messages:
 - Move AsTypeMethodHandleDesc to constant API impl package

Changes: https://git.openjdk.org/jdk/pull/26542/files
  Webrev: https://webrevs.openjdk.org/?repo=jdk&pr=26542&range=00
  Issue: https://bugs.openjdk.org/browse/JDK-8364319
  Stats: 156 lines in 4 files changed: 80 ins; 74 del; 2 mod
  Patch: https://git.openjdk.org/jdk/pull/26542.diff
  Fetch: git fetch https://git.openjdk.org/jdk.git pull/26542/head:pull/26542

PR: https://git.openjdk.org/jdk/pull/26542