[wasm] Forbid sign mismatch in asm typer.

test/mjsunit/wasm/asm-wasm-i32.js

Index: test/mjsunit/wasm/asm-wasm-i32.js
diff --git a/test/mjsunit/wasm/asm-wasm-i32.js b/test/mjsunit/wasm/asm-wasm-i32.js
index 6224e8fa1f49f2f9ad32394284208e6e2c6045d1..cffd1738c197cb85a6cb43bb208872a66fd9b7a7 100644
--- a/test/mjsunit/wasm/asm-wasm-i32.js
+++ b/test/mjsunit/wasm/asm-wasm-i32.js
@@ -67,13 +67,13 @@ function i32_mul(a, b) {
 function i32_div(a, b) {
   a = a | 0;
   b = b | 0;
-  return (a / b) | 0;
+  return ((a | 0) / (b | 0)) | 0;
 }
 
 function i32_mod(a, b) {
   a = a | 0;
   b = b | 0;
-  return (a % b) | 0;
+  return ((a | 0) % (b | 0)) | 0;
 }
 
 function i32_and(a, b) {