[analyzer] Add blocks and ObjC messages to the call graph.

This paves the road for constructing a better function dependency graph.
If we analyze a function before the functions it calls and inlines,
there is more opportunity for optimization.

Note, we add call edges to the called methods that correspond to
function definitions (declarations with bodies).

git-svn-id: https://llvm.org/svn/llvm-project/cfe/trunk@170825 91177308-0d34-0410-b5e6-96231b3b80d8

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