R0 = 0
R1 = pointer to base of heap
R2 = number of anchors to allocate, or 0 for default (currently 256)
Initialises heap. R1 points to the base of the heap - it will grow upwards from here. R2 specifies the numbers of anchors to allocate - this is effectively the maximum number of blocks you may have allocated at any one time. Each anchor takes 4 bytes. Note that R1 is rounded up to the nearest multiple of 8 plus 4 (ie. 8N+4).
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