GC_is_heap_base   706 gc/dyn_load.c    extern GC_bool GC_is_heap_base (ptr_t p);
GC_is_heap_base   883 gc/dyn_load.c  		&& !GC_is_heap_base(buf.AllocationBase)
GC_is_heap_base  1334 gc/os_dep.c                || GC_is_heap_base(buf.AllocationBase)) break;