Add __init__ function to all modules created in asm-to-wasm

test/mjsunit/wasm/asm-wasm.js

 // Copyright 2015 the V8 project authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 // Flags: --expose-wasm
 
 function EmptyTest() {
   "use asm";
   function caller() {
     empty();
@@ skipping 739 matching lines @@
       }
       default: return 0;
     }
     return 0;
   }
 
   return {caller:caller};
 }
 
 assertEquals(43, _WASMEXP_.asmCompileRun(TestNestedSwitch.toString()));
+
+function TestInitFunctionWithNoGlobals() {
+  "use asm";
+  function caller() {
+    return 51;
+  }
+  return {caller};
+}
+
+var module = _WASMEXP_.instantiateModuleFromAsm(
+    TestInitFunctionWithNoGlobals.toString());
+module.__init__();
+assertEquals(51, module.caller());
+
+function TestExportNameDifferentFromFunctionName() {
+  "use asm";
+  function caller() {
+    return 55;
+  }
+  return {alt_caller:caller};
+}
+
+var module = _WASMEXP_.instantiateModuleFromAsm(
+    TestExportNameDifferentFromFunctionName.toString());
+module.__init__();
+assertEquals(55, module.alt_caller());