RFR: 8300237: Minor improvements in MethodHandles [v3]

[Sergey Tsypanov]

> - `MethodType.ptypes()` can be used instead of `MethodType.parameterList()` when we don't need a copy
> - comparison of two lists can be done without `Stream.reduce()`

Sergey Tsypanov has updated the pull request incrementally with one additional commit since the last revision:

  Polishing

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Changes:
  - all: https://git.openjdk.org/jdk/pull/12025/files
  - new: https://git.openjdk.org/jdk/pull/12025/files/6d1397c4..cab00aee

Webrevs:
 - full: https://webrevs.openjdk.org/?repo=jdk&pr=12025&range=02
 - incr: https://webrevs.openjdk.org/?repo=jdk&pr=12025&range=01-02

  Stats: 14 lines in 1 file changed: 0 ins; 6 del; 8 mod
  Patch: https://git.openjdk.org/jdk/pull/12025.diff
  Fetch: git fetch https://git.openjdk.org/jdk pull/12025/head:pull/12025

PR: https://git.openjdk.org/jdk/pull/12025