[analyzer] Start fixing modeling of bool based types

This is a follow up for one of 
the previous diffs https://reviews.llvm.org/D32328.
getTypeSize and with getIntWidth are not equivalent for bool 
(see https://clang.llvm.org/doxygen/ASTContext_8cpp_source.html#l08444),
this causes a number of issues
(for instance, if APint X representing a bool is created 
with the wrong bit width then X is not comparable against Min/Max
(because of the different bit width), that results in crashes 
(triggered asserts) inside assume* methods), 
for examples see the newly added test cases.

Test plan: make check-all

Differential revision: https://reviews.llvm.org/D35041


git-svn-id: https://llvm.org/svn/llvm-project/cfe/trunk@307604 91177308-0d34-0410-b5e6-96231b3b80d8