C: Make instrs_graph return just control flow graph

Previously instrs_graph would return the control-flow graph, as well
as some data-flow by including reads and writes to variables
represented as a node type in the graph (G_id). However, this was not
particularly useful, and since the graph isn't in SSA form (so
identifiers are non-unique) potentially inaccurate too. This
simplifies the code so instrs_graph just returns control flow
dependencies, which in turn simplifies the instr_reads and
instr_writes functions.

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