prot              620 gc/os_dep.c    # define is_writable(prot) ((prot) == PAGE_READWRITE \
prot              621 gc/os_dep.c    			    || (prot) == PAGE_WRITECOPY \
prot              622 gc/os_dep.c    			    || (prot) == PAGE_EXECUTE_READWRITE \
prot              623 gc/os_dep.c    			    || (prot) == PAGE_EXECUTE_WRITECOPY)