Track size change of alloc_blocks and alloc_blocks_lim.
(They are of type nat, which used to be the same size as W_, but now is
the same size as CInt).
TICK_ALLOC_HEAP_NOCTR(alloc);
#define MAYBE_GC(liveness,reentry) \
- if (W_[alloc_blocks] >= W_[alloc_blocks_lim]) { \
+ if (CInt[alloc_blocks] >= CInt[alloc_blocks_lim]) { \
R9 = liveness; \
R10 = reentry; \
jump stg_gc_gen_hp; \