RFR: 8317868: Add @sealedGraph to MethodHandleDesc and descendants [v2]

[Per Minborg]

> This PR proposes to add  @sealedGraph to MethodHandleDesc and descendants.

Per Minborg has updated the pull request incrementally with two additional commits since the last revision:

 - Update copyright year
 - Revoke change in DMHD

-------------

Changes:
  - all: https://git.openjdk.org/jdk/pull/16137/files
  - new: https://git.openjdk.org/jdk/pull/16137/files/dd6d4103..dc368d77

Webrevs:
 - full: https://webrevs.openjdk.org/?repo=jdk&pr=16137&range=01
 - incr: https://webrevs.openjdk.org/?repo=jdk&pr=16137&range=00-01

  Stats: 2 lines in 1 file changed: 0 ins; 1 del; 1 mod
  Patch: https://git.openjdk.org/jdk/pull/16137.diff
  Fetch: git fetch https://git.openjdk.org/jdk.git pull/16137/head:pull/16137

PR: https://git.openjdk.org/jdk/pull/16137