Avoid dependency on frame layout for LJ_POST_FIXCOMP.

The auxiliary value in u32.lo wasn't used, anyway.

src/lj_crecord.c

@@ -1484,8 +1484,7 @@ void LJ_FASTCALL recff_cdata_arith(jit_State *J, RecordFFData *rd)
 	!irt_isguard(J->guardemit)) {
       const BCIns *pc = frame_contpc(J->L->base-1) - 1;
       if (bc_op(*pc) <= BC_ISNEP) {
-	setframe_pc(&J2G(J)->tmptv, pc);
-	J2G(J)->tmptv.u32.lo = ((tref_istrue(tr) ^ bc_op(*pc)) & 1);
+	J2G(J)->tmptv.u64 = (uint64_t)(uintptr_t)pc;
 	J->postproc = LJ_POST_FIXCOMP;
       }
     }

src/lj_record.c

@@ -1793,7 +1793,7 @@ void lj_record_ins(jit_State *J)
   if (LJ_UNLIKELY(J->postproc != LJ_POST_NONE)) {
     switch (J->postproc) {
     case LJ_POST_FIXCOMP:  /* Fixup comparison. */
-      pc = frame_pc(&J2G(J)->tmptv);
+      pc = (const BCIns *)(uintptr_t)J2G(J)->tmptv.u64;
       rec_comp_fixup(J, pc, (!tvistruecond(&J2G(J)->tmptv2) ^ (bc_op(*pc)&1)));
       /* fallthrough */
     case LJ_POST_FIXGUARD:  /* Fixup and emit pending guard. */