fix Issue 9245 - [CTFE] postblit not called on static array initialization

On element-wise or block assignment, currently postblit call is implicitly
handled by glue-layer. Therefore, interpreter should have its own postblit
handling.
Merge pull request #3488 from 9rnsr/fix9245

Issue 9245 - [CTFE] postblit not called on static array initialization