RFR: 8284871: Use covariant overrides for the resolveConstantDesc(Lookup) method in sub‑interfaces of java.lang.constant.ConstantDesc [v4]

[Chen Liang]

> Also remove redundant casts to avoid javac warnings.

Chen Liang has updated the pull request incrementally with one additional commit since the last revision:

  Redundant casts in benchmark

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Changes:
  - all: https://git.openjdk.org/jdk/pull/12986/files
  - new: https://git.openjdk.org/jdk/pull/12986/files/23670070..7ff2d4a4

Webrevs:
 - full: https://webrevs.openjdk.org/?repo=jdk&pr=12986&range=03
 - incr: https://webrevs.openjdk.org/?repo=jdk&pr=12986&range=02-03

  Stats: 3 lines in 1 file changed: 0 ins; 0 del; 3 mod
  Patch: https://git.openjdk.org/jdk/pull/12986.diff
  Fetch: git fetch https://git.openjdk.org/jdk.git pull/12986/head:pull/12986

PR: https://git.openjdk.org/jdk/pull/12986