=> R0 = 4
R1 = pointer to heap
R2 = pointer to anchor
R3 = bytes to be added or removed from the end of the specified block (a signed integer)
<= R1 = -1 for success, 0 for failure
This call is used to add (R3 positive) or remove (R3 negative) memory to/from the end of the specified block.
If adding to a block, then on return R1 holds a value indicating whether the operation was successful or not.
If removing from a block, then the resultant free memory is returned back to the free pool.
Note that as with the claim operation, block sizes are rounded up to at least the nearest multiple of four bytes. This means that if you try to remove, say, 3 bytes from a block (R3 = -3) then nothing will be removed since -3 is rounded up to zero.
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