GC_in_save_callers 4013 gc/os_dep.c      GC_in_save_callers = FALSE;
GC_in_save_callers 4026 gc/os_dep.c        if (GC_in_save_callers) {
GC_in_save_callers 4031 gc/os_dep.c        GC_in_save_callers = TRUE;
GC_in_save_callers 4038 gc/os_dep.c        GC_in_save_callers = FALSE;