RFR: 8292972: Initialize fields if CodeBlobIterator shortcuts without heaps

[Christian Hagedorn]

On Fri, 26 Aug 2022 09:35:04 GMT, Aleksey Shipilev <shade at openjdk.org> wrote:

> SonarCloud reports that `CodeBlobIterator::_code_blob` is not initialized on shortcut path:
> 
> 
>   CodeBlobIterator(LivenessFilter filter, T* nm = NULL)
>     : _only_not_unloading(filter == only_not_unloading)
>   {
>     if (Filter::heaps() == NULL) {
>       return; <---- here
>     }
> 
> 
> It seems that we don't have an actual bug here, as iterator shortcuts on `_heap == _end`, but it would be cleaner to avoid garbage anyway.

Looks good!

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

Marked as reviewed by chagedorn (Reviewer).

PR: https://git.openjdk.org/jdk/pull/10041