Fix some issues when running phpsa on phpsa source

[ddmler]

Hey!

Type: bug fix | code quality

Link to issue: #83 & #205

This pull request affects the following components (please check boxes):

• [x] Core
• [ ] Analyzer
• [x] Compiler
• [ ] Control Flow Graph
• [ ] Documentation

In raising this pull request, I confirm the following (please check boxes):

• [x] I have read and understood the Contributing Guidelines.
• [x] I have checked that another pull request for this purpose does not exist.
• [ ] I wrote some tests for this PR.

Small description of change:

Array short syntax for some class properties that were not tested when we first changed all of them.

FunctionDefinition (and closure) now gives parameters correct type when type hinting is used.

[ovr]

Thanks @ddmler, awesome 👍