RFR: 8282662: Use List.of() factory method to reduce memory consumption [v8]

[Сергей Цыпанов]

> `List.of()` along with `Set.of()` create unmodifiable `List/Set` but with smaller footprint comparing to `Arrays.asList()` / `new HashSet()` when called with vararg of size 0, 1, 2.
> 
> In general replacement of `Arrays.asList()` with `List.of()` is dubious as the latter is null-hostile, however in some cases we are sure that arguments are non-null. Into this PR I've included the following cases (in addition to those where the argument is proved to be non-null at compile-time):
> - `MethodHandles.longestParameterList()` never returns null
> - parameter types are never null
> - interfaces used for proxy construction and returned from `Class.getInterfaces()` are never null
> - exceptions types of method signature are never null

Сергей Цыпанов has updated the pull request with a new target base due to a merge or a rebase. The pull request now contains six commits:

 - 8282662: Revert wrong copyright year change
 - 8282662: Revert ProxyGenerator
 - 8282662: Revert ProxyGenerator
 - 8282662: Revert dubious changes in MethodType
 - 8282662: Revert dubious changes
 - 8282662: Use List/Set.of() factory methods to save memory

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Changes: https://git.openjdk.java.net/jdk/pull/7729/files
 Webrev: https://webrevs.openjdk.java.net/?repo=jdk&pr=7729&range=07
  Stats: 13 lines in 5 files changed: 1 ins; 2 del; 10 mod
  Patch: https://git.openjdk.java.net/jdk/pull/7729.diff
  Fetch: git fetch https://git.openjdk.java.net/jdk pull/7729/head:pull/7729

PR: https://git.openjdk.java.net/jdk/pull/7729