RFR: 8300237: Minor improvements in MethodHandles [v2]

[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:

  Simplify

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

Changes:
  - all: https://git.openjdk.org/jdk/pull/12025/files
  - new: https://git.openjdk.org/jdk/pull/12025/files/e9e0baa0..6d1397c4

Webrevs:
 - full: https://webrevs.openjdk.org/?repo=jdk&pr=12025&range=01
 - incr: https://webrevs.openjdk.org/?repo=jdk&pr=12025&range=00-01

  Stats: 6 lines in 1 file changed: 1 ins; 2 del; 3 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