Fix crash on RGENGC_CHECK_MODE=4 #4610
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When running btest there is a crash when compiled with RGENGC_CHECK_MODE=4. The crash happens because `during_gc` is not turned off before `gc_marks_check` is called, causing the marking to happen on the main mark stack instead of mark stack created in `objspace_allrefs`.
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When running btest there is a crash when compiled with RGENGC_CHECK_MODE=4. The crash happens because
during_gcis not turned off beforegc_marks_checkis called, causing the marking to happen on the main mark stack instead of mark stack created inobjspace_allrefs.