HDR               190 gc/include/private/gc_hdrs.h #	define HDR(p) GC_find_header((ptr_t)(p))
HDR               192 gc/include/private/gc_hdrs.h #	define HDR(p) HDR_INNER(p)
HDR               223 gc/include/private/gc_hdrs.h #   define HDR(p) GC_find_header((ptr_t)(p))