pan/midgard: Implement linearly constrained register allocation
Add the reference implementation linearly-constrained register allocation, and move the Midgard compiler from util/ra (graph colouring) to LCRA.
Edited by Alyssa Rosenzweig
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Add the reference implementation linearly-constrained register allocation, and move the Midgard compiler from util/ra (graph colouring) to LCRA.