Provide separate visitor templates for the three hierarchies, and also
the `FullSValVisitor' class, which is a union of all three visitors.

Additionally, add a particular example visitor, `SValExplainer', in order to
test the visitor templates. This visitor is capable of explaining the SVal,
SymExpr, or MemRegion in a natural language.

Compared to the reverted r257605, this fixes the test that used to fail
on some triples, and fixes build failure under -fmodules.

Differential Revision: http://reviews.llvm.org/D15448


git-svn-id: https://llvm.org/svn/llvm-project/cfe/trunk@257893 91177308-0d34-0410-b5e6-96231b3b80d8