new warnings

Since I had such good luck with the last set, here are a few more:

GRExprEngine.cpp: In member function 'void clang::GRExprEngine::VisitBinaryOperator(clang::BinaryOperator*, clang::ExplodedNode<clang::GRState>*, clang::ExplodedNodeSet<clang::GRState>&)':
GRExprEngine.cpp:2069: warning: dereferencing type-punned pointer will break strict-aliasing rules
GRExprEngine.cpp:2071: warning: dereferencing type-punned pointer will break strict-aliasing rules
RValues.cpp: In member function 'const clang::SymbolID* clang::RVal::symbol_begin() const':
RValues.cpp:33: warning: dereferencing type-punned pointer will break strict-aliasing rules
RValues.cpp:35: warning: dereferencing type-punned pointer will break strict-aliasing rules

:slight_smile: With these, I think we are back down to 0 warnings.

I haven't fixed those yet because I just plan on rewriting some of that code entirely.