support llvm

[fzhedu]

due to the expression module has refactored, the llvm couldn't run, so need update llvm.
changes to expression:
change all class, but the main idea is the same with the old expression module, the essential improvement is adding get_type which result from child's actual_type through TypeConversionMatrix::type_conversion_matrix, so the operation at that node = data_type_oper_func_[get_type][oper_type].