RFR: JDK-8315137: Add explicit override RecordComponentElement.asType() [v2]

[Joe Darcy]

> No change in semantics, just adding more explicit information.

Joe Darcy has updated the pull request incrementally with one additional commit since the last revision:

  Fix typo noticed during code review.

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

Changes:
  - all: https://git.openjdk.org/jdk/pull/15456/files
  - new: https://git.openjdk.org/jdk/pull/15456/files/dc309f55..397b2bb2

Webrevs:
 - full: https://webrevs.openjdk.org/?repo=jdk&pr=15456&range=01
 - incr: https://webrevs.openjdk.org/?repo=jdk&pr=15456&range=00-01

  Stats: 1 line in 1 file changed: 0 ins; 0 del; 1 mod
  Patch: https://git.openjdk.org/jdk/pull/15456.diff
  Fetch: git fetch https://git.openjdk.org/jdk.git pull/15456/head:pull/15456

PR: https://git.openjdk.org/jdk/pull/15456