RFR: 8282662: Use List.of() factory method to reduce memory consumption [v4]

[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 incremental webrev excludes the unrelated changes brought in by the merge/rebase. The pull request contains five additional commits since the last revision:

 - 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

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

Changes:
  - all: https://git.openjdk.java.net/jdk/pull/7729/files
  - new: https://git.openjdk.java.net/jdk/pull/7729/files/e765c42a..87c6623b

Webrevs:
 - full: https://webrevs.openjdk.java.net/?repo=jdk&pr=7729&range=03
 - incr: https://webrevs.openjdk.java.net/?repo=jdk&pr=7729&range=02-03

  Stats: 575367 lines in 7617 files changed: 421069 ins; 87224 del; 67074 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