RFR: 8155591: Misleading warning when not overriding close method in interface extending AutoCloseable [v4]

[Archie Cobbs]

> The compiler generates a warning if you declare a `close()` method that throws any supertype of `InterruptedException` in a class or interface extending `AutoCloseable`. This is because suppressed `InterruptedException`'s are likely to lead to misbehavior at runtime.
> 
> However, this feature also generates a warning due to `AutoCloseable.close()` itself, if you simply inherit it. For example:
> 
> $ cat MyClass.java
> public interface MyClass extends AutoCloseable {
> }
> $ javac -Xlint:try MyClass.java
> MyClass.java:1: warning: [try] auto-closeable resource MyClass has a member method close() that could throw InterruptedException
> public interface MyClass extends AutoCloseable {
>        ^
> 1 warning
> 
> The warning is not useful because `AutoCloseable.close()` is abstract and so it's going to be some other class' job to deal with the throws clause.
> 
> This change prevents `AutoCloseable.close()` itself from triggering the warning in a class declaration. We preserve the existing behavior in which a warning is generated at the use site (i.e., at the try-with-resources statement).

Archie Cobbs has updated the pull request incrementally with three additional commits since the last revision:

 - Add another regression test case.
 - Unbreak existing regression test after previous commit.
 - Show warnings for declared close() at declaration site.

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

Changes:
  - all: https://git.openjdk.org/jdk/pull/27062/files
  - new: https://git.openjdk.org/jdk/pull/27062/files/d9b78c60..b79b5951

Webrevs:
 - full: https://webrevs.openjdk.org/?repo=jdk&pr=27062&range=03
 - incr: https://webrevs.openjdk.org/?repo=jdk&pr=27062&range=02-03

  Stats: 72 lines in 6 files changed: 27 ins; 0 del; 45 mod
  Patch: https://git.openjdk.org/jdk/pull/27062.diff
  Fetch: git fetch https://git.openjdk.org/jdk.git pull/27062/head:pull/27062

PR: https://git.openjdk.org/jdk/pull/27062