debug subtract error

test/mjsunit/wasm/asm-wasm.js

Index: test/mjsunit/wasm/asm-wasm.js
diff --git a/test/mjsunit/wasm/asm-wasm.js b/test/mjsunit/wasm/asm-wasm.js
index 2efb006436a23333c7bf5bb48d92a46022a7d2d5..7d271f30cc73052df66507024891a09cc2e3bbf9 100644
--- a/test/mjsunit/wasm/asm-wasm.js
+++ b/test/mjsunit/wasm/asm-wasm.js
@@ -1493,3 +1493,16 @@ assertWasm(1, TestXor);
   assertEquals(0x80000000, wasm.u0x80000000());
   assertEquals(0x87654321, wasm.u0x87654321());
 })();
+
+(function SubtractDebug() {
+  function asmModule() {
+    "use asm";
+    function main(x) {
+      x = x|0;
+      return (x - 0)|0;
+    }
+    return {main:main};
+  }
+  var wasm = Wasm.instantiateModuleFromAsm(asmModule.toString());
+  assertEquals(-1, wasm.main(-1));
+})();