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NewCodeGenPipeline

v39	v40
48	48	* Convert graph to annotated graph whose nodes are `CmmRewriteAssignments.WithRegUsage`. Specifically, `CmmAssign` is decorated with a flag `RegUsage` saying whether it is used once or many times.
49	49	* Sink or inline assignments nearer their use points
	50	* Do constant mach-op folding. This is done in this phase, because folded mach-ops can be inlined, and inlining exposes opportunities for mach-op folding.
50	51
51	52	* '''Remove dead assignments and stores''', implemented in `CmmLive`, removes assignments to dead variables and things like ``a = a`` or ``I32[Hp] = I32[Hp]``. The latter may more appropriately be done in a general optimization pass, as it doesn't take advantage of liveness information.