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

[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).

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

Commit messages:
 - Don't warn about AutoCloseable.close() itself throwing InterruptedException.

Changes: https://git.openjdk.org/jdk/pull/27062/files
  Webrev: https://webrevs.openjdk.org/?repo=jdk&pr=27062&range=00
  Issue: https://bugs.openjdk.org/browse/JDK-8155591
  Stats: 89 lines in 3 files changed: 86 ins; 0 del; 3 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