RFR: 8298177: Various java.lang.invoke cleanups [v4]

[Claes Redestad]

> Various code cleanups around java.lang.invoke code. Started out with dead code removal in `jli.MemberName`, then piled on to fix a set of minor inefficiencies (excessive vararg array allocations, unnecessary defensive cloning of parameter arrays etc).

Claes Redestad has updated the pull request incrementally with one additional commit since the last revision:

  Cleanup more unused imports. Further code removals.

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Changes:
  - all: https://git.openjdk.org/jdk/pull/11540/files
  - new: https://git.openjdk.org/jdk/pull/11540/files/5a04e500..5988749c

Webrevs:
 - full: https://webrevs.openjdk.org/?repo=jdk&pr=11540&range=03
 - incr: https://webrevs.openjdk.org/?repo=jdk&pr=11540&range=02-03

  Stats: 95 lines in 4 files changed: 0 ins; 93 del; 2 mod
  Patch: https://git.openjdk.org/jdk/pull/11540.diff
  Fetch: git fetch https://git.openjdk.org/jdk pull/11540/head:pull/11540

PR: https://git.openjdk.org/jdk/pull/11540