RFR: 8290041: ModuleDescriptor.hashCode is inconsistent

[Jaikiran Pai]

On Sat, 6 Aug 2022 08:08:43 GMT, Jaikiran Pai <jpai at openjdk.org> wrote:

> Can I please get a review of this change which proposes to fix https://bugs.openjdk.org/browse/JDK-8290041? 
> 
> As noted by the reporter, the current implementation is buggy since the calculation can result in a different value of the hashcode depending on the order of iteration of the `Modifier`s. The commit in this PR changes that computation to produce consistent result irrespective of the order in which the `Modifier`s (enum) is iterated upon.
> 
> A new test has been added which reproduces the issue and verifies the fix.

Hello Alan, Peter, you are right - the hashcode computation and do away with the `* 43` part. I've updated this PR to do that change. I've also updated the tests to add coverage for the exports and requires modifiers as suggested by Alan.

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

PR: https://git.openjdk.org/jdk/pull/9790