Hex2 qemu optimization #42
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Switches read-write buffer to use stack. This speeds up hex2 from about 8s to build itself to 0.3s. scratch usage is not optimized for qemu but there are significantly fewer calls to it, so gains would be small.
stikonas
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This PR also contains prototypes for M0.
hex1 is optimized as well (inserted one nop instruction there to avoid recalculating jumps).