Fix compiler warnings.

src/lj_asm.c

@@ -1558,7 +1558,7 @@ static void asm_setup_regsp(ASMState *as, int sink)
   if (as->parent) {
     uint16_t *p;
     lastir = lj_snap_regspmap(as->parent, as->J->exitno, ir);
-    as->stopins = (lastir-1) - as->ir;
+    as->stopins = (IRRef)((lastir-1) - as->ir);
     for (p = as->parentmap; ir < lastir; ir++) {
       RegSP rs = ir->prev;
       *p++ = (uint16_t)rs;  /* Copy original parent RegSP to parentmap. */

src/lj_cparse.c

@@ -225,7 +225,8 @@ static CPToken cp_param(CPState *cp)
     return CTOK_INTEGER;
   } else {
     GCcdata *cd;
-    if (!tviscdata(o)) lj_err_argtype(cp->L, o-cp->L->base+1, "type parameter");
+    if (!tviscdata(o))
+      lj_err_argtype(cp->L, (int)(o-cp->L->base)+1, "type parameter");
     cd = cdataV(o);
     if (cd->ctypeid == CTID_CTYPEID)
       cp->val.id = *(CTypeID *)cdataptr(cd);