RB_GC_SAVE_MACHINE_CONTEXT  138 thread.c         RB_GC_SAVE_MACHINE_CONTEXT(_th_stored); \
RB_GC_SAVE_MACHINE_CONTEXT 1232 thread.c       	    RB_GC_SAVE_MACHINE_CONTEXT(th);
RB_GC_SAVE_MACHINE_CONTEXT 1260 thread.c       	RB_GC_SAVE_MACHINE_CONTEXT(th);