[analyzer] const init: handle non-explicit cases more accurately

Summary: If the access is out of bounds, return UndefinedVal. If it is missing an explicit init, return the implicit zero value it must have.

Reviewers: NoQ, xazax.hun, george.karpenkov

Reviewed By: NoQ

Subscribers: szepet, rnkovacs, a.sidorin, cfe-commits

Differential Revision: https://reviews.llvm.org/D46823

llvm-svn: 333417