[wasm] W.validate should not throw on failure

src/wasm/wasm-js.cc

Index: src/wasm/wasm-js.cc
diff --git a/src/wasm/wasm-js.cc b/src/wasm/wasm-js.cc
index c281bf5c1cd8bf277f600723ff5cf8731ccfaa97..ee8e87de07788cb06463d9ab3c842d00d9e24b99 100644
--- a/src/wasm/wasm-js.cc
+++ b/src/wasm/wasm-js.cc
@@ -159,6 +159,7 @@ void WebAssemblyValidate(const v8::FunctionCallbackInfo<v8::Value>& args) {
   if (ValidateModule(isolate, args[0], &thrower)) {
     return_value.Set(v8::True(isolate));
   } else {
+    if (thrower.wasm_error()) thrower.Reify();  // Clear error.
     return_value.Set(v8::False(isolate));
   }
 }