RFR: 8298177: Various java.lang.invoke cleanups [v3]

[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:

  Fix 8284363, more code removal

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Changes:
  - all: https://git.openjdk.org/jdk/pull/11540/files
  - new: https://git.openjdk.org/jdk/pull/11540/files/c29ce261..5a04e500

Webrevs:
 - full: https://webrevs.openjdk.org/?repo=jdk&pr=11540&range=02
 - incr: https://webrevs.openjdk.org/?repo=jdk&pr=11540&range=01-02

  Stats: 19 lines in 1 file changed: 0 ins; 19 del; 0 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