Add Wasm annotation to use native instructions

PiperOrigin-RevId: 359433958
Change-Id: Iafd31c1071c08151a0525b8cd102b73bd71e4cdf

user/super/com/google/gwt/emul/javaemul/internal/annotations/Wasm.java

diff --git a/user/super/com/google/gwt/emul/javaemul/internal/annotations/Wasm.java b/user/super/com/google/gwt/emul/javaemul/internal/annotations/Wasm.java
new file mode 100644
index 0000000..b20197e
--- /dev/null
+++ b/user/super/com/google/gwt/emul/javaemul/internal/annotations/Wasm.java
@@ -0,0 +1,26 @@
+/*
+ * Copyright 2014 Google Inc.
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License"); you may not
+ * use this file except in compliance with the License. You may obtain a copy of
+ * the License at
+ *
+ * http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS, WITHOUT
+ * WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. See the
+ * License for the specific language governing permissions and limitations under
+ * the License.
+ */
+package javaemul.internal.annotations;
+
+import java.lang.annotation.ElementType;
+import java.lang.annotation.Target;
+
+/** An annotation to mark a method to point to native WASM functionality. */
+@CompilerHint
+@Target(ElementType.METHOD)
+public @interface Wasm {
+  String value();
+}