[Analyzer][VLASizeChecker] Check VLA size in typedef and sizeof.

Summary:
The check of VLA size was done previously for variable declarations
(of VLA type) only. Now it is done for typedef (and type-alias)
and sizeof expressions with VLA too.

Reviewers: Szelethus, martong

Reviewed By: Szelethus, martong

Subscribers: rnkovacs, xazax.hun, baloghadamsoftware, szepet, a.sidorin, mikhail.ramalho, Szelethus, donat.nagy, dkrupp, gamesh411, Charusso, martong, ASDenysPetrov, cfe-commits

Tags: #clang

Differential Revision: https://reviews.llvm.org/D79072