RFR: JDK-8296743: Tighten Class.getModifiers spec for array classes

[Dan Heidinga]

On Fri, 18 Nov 2022 03:26:38 GMT, Joe Darcy <darcy at openjdk.org> wrote:

> Update the spec of Class.getModifiers to match long-standing behavior for primitive and array classes. Remove unneeded implementation flexibility with regard to setting other bit positions. This work was prompted to better support anticipated future Valhalla changes.
> 
> Please also review the CSR: https://bugs.openjdk.org/browse/JDK-8297237

src/java.base/share/classes/java/lang/Class.java line 1306:

> 1304:      *      {@code true}
> 1305:      * <li> its interface modifier is always {@code false}, event when
> 1306:      *      the component type is an interface

Should this mention that all array classes will also have their `abstract` modifier set?  The test cases seem to confirm that it's expected but we haven't stated it explicitly here.

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PR: https://git.openjdk.org/jdk/pull/11229