Initialise a client with MAlloc
=> r0 = pointer to a null terminated string
r1 = flags:
bit 0 = OK to use top of WimpSlot instead of a dynamic area
bit 1 = If using top of WimpSlot, r2 points to top of program
bits 2-31 reserved
r2 = top of program, if bit 1 of r1 set
r3 = initial size of heap
<= r0 = address of heap
MAlloc claims a heap and sets it up. On a dynamic area enabled machine, a dynamic area will be created, using the name pointed to by r0. If dynamic areas are not available, then bit 0 of r1 is checked. If it is clear, an error is returned. If set, then MAlloc will use the memory above the top of the program as the heap. If bit 1 of r1 is set, then the value in r2 is used as the beginning of the heap, else OS_GetEnv is used to find the top of RAM.
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