GC_PTR_STORE      852 gc/include/gc.h #   define GC_PTR_STORE(p, q) \
GC_PTR_STORE      855 gc/include/gc.h #   define GC_PTR_STORE(p, q) \
GC_PTR_STORE      859 gc/include/gc.h #   define GC_PTR_STORE(p, q) *((p) = (q))