BP5 + operator for local array

[pnorbert]

Apparently, BP5 does not support operators for local arrays, neither for writing nor reading.

[eisenhauer]

Hmmm. No tests for that anywhere? From a quick glance at BP5 serializer, they should be supported for everything that's not a single value, but maybe there's a non-obvious problem.

[eisenhauer]

Well, the logic for operator block sizing is missing on the read side for the Local case in GenerateReadRequests... Might be more stuff, but it's where I'm starting.

[eisenhauer]

Quick PR submitted. It needs better test cases, but if you have one, give this a go.

[pnorbert]

Fixed by #3989