RFR: 8282662: Use List/Set.of() factory methods to reduce memory consumption

[Daniel Fuchs]

On Mon, 7 Mar 2022 15:11:50 GMT, Сергей Цыпанов <duke at openjdk.java.net> wrote:

> `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

There's also another difference: they have different serial forms. From my cursory inspection it doesn't look like the returned list are put in serializable fields but it could be good to double check it.

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

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