fix               219 gc/dyn_load.c  	--> fix mutual exclusion with dlopen
fix               539 gc/include/private/gc_priv.h     --> fix HBLKSIZE
fix               203 gc/mach_dep.c                add.w   #4,sp                   ; fix stack.
fix               571 gc/mach_dep.c  	--> fix it
fix                21 gc/pthread_stop_world.c   --> please fix it
fix               139 gc/reclaim.c   	--> potential overflow; fix the code