[analyzer] Bifurcate the path with dynamic dispatch.

This is an initial (unoptimized) version. We split the path when
inlining ObjC instance methods. On one branch we always assume that the
type information for the given memory region is precise. On the other we
assume that we don't have the exact type info. It is important to check
since the class could be subclassed and the method can be overridden. If
we always inline we can loose coverage.

Had to refactor some of the call eval functions.

llvm-svn: 161552

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