RFR: 8290041: ModuleDescriptor.hashCode is inconsistent [v2]

[Jaikiran Pai]

On Thu, 11 Aug 2022 14:16:51 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.
>
> Jaikiran Pai has updated the pull request incrementally with one additional commit since the last revision:
> 
>   incorporate review comments and add more testing

I've now updated the PR to rename `mdb` to `builder` and add relevant imports to reduce line lengths where those enums were referenced.

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

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