add an additional assert for the future

Author: Sergey Andreenko

src/jit/codegenarm.cpp

@@ -627,9 +627,11 @@ instruction CodeGen::genGetInsForOper(genTreeOps oper, var_types type)
         case GT_MUL:
             ins = INS_MUL;
             break;
+#if !defined(USE_HELPERS_FOR_INT_DIV)
         case GT_DIV:
             ins = INS_sdiv;
             break;
+#endif // !USE_HELPERS_FOR_INT_DIV
         case GT_LSH:
             ins = INS_SHIFT_LEFT_LOGICAL;
             break;
@@ -1090,6 +1092,10 @@ void CodeGen::genCodeForDivMod(GenTreeOp* tree)
     // on float/double args.
     noway_assert(tree->OperIs(GT_DIV) || !varTypeIsFloating(tree));
 
+#if defined(USE_HELPERS_FOR_INT_DIV)
+    noway_assert(!varTypeIsIntOrI(tree));
+#endif // USE_HELPERS_FOR_INT_DIV
+
     var_types targetType = tree->TypeGet();
     regNumber targetReg  = tree->gtRegNum;
     emitter*  emit       = getEmitter();

src/jit/emitarm.cpp

@@ -2985,8 +2985,11 @@ void emitter::emitIns_R_R_R(instruction ins,
             }
             __fallthrough;
 
+#if !defined(USE_HELPERS_FOR_INT_DIV)
         case INS_sdiv:
         case INS_udiv:
+#endif // !USE_HELPERS_FOR_INT_DIV
+
             assert(insDoesNotSetFlags(flags));
             fmt = IF_T2_C5;
             sf  = INS_FLAGS_NOT_SET;

src/jit/lower.cpp

@@ -4719,6 +4719,10 @@ GenTree* Lowering::LowerConstIntDivOrMod(GenTree* node)
     const var_types type = divMod->TypeGet();
     assert((type == TYP_INT) || (type == TYP_LONG));
 
+#if defined(USE_HELPERS_FOR_INT_DIV)
+    unreached();
+#endif // USE_HELPERS_FOR_INT_DIV
+
     if (dividend->IsCnsIntOrI())
     {
         // We shouldn't see a divmod with constant operands here but if we do then it's likely