Factor utility functions for IR into separate file and struct update optimizations.

Move the utility functions for graph generation and pretty printing of
intermediate representation instructions into a separate file,
bytecode_util.ml, by analogy with ast_util.ml.

Add an optimization pass that searches for specific patterns of struct
updates and removes uncessary copying of the structs involved. With
this optimisation pass the time taken for u-boot to run approx
57,000,000 instructions goes down from about 11-12 minutes to 8
minutes (about 120,000 IPS).

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