Noissue - [emscripten] Call the correct constructor for strings created from JavaScript

compiled/bindings/runtime_utils.cpp

 #include "runtime.h"
 #include "../intrusive_ptr.h"
 #include "../String.h"
 
 extern "C"
 {
   void BINDINGS_EXPORTED InitString(DependentString* str,
       String::value_type* data, String::size_type len)
   {
     // String is already allocated on stack, we merely need to call
     // constructor.
     new (str) DependentString(data, len);
   }
 
+  void BINDINGS_EXPORTED InitOwnedString(OwnedString* str)
+  {
+    // String is already allocated on stack, we merely need to call
+    // constructor.
+    new (str) OwnedString();
+  }
+
   void BINDINGS_EXPORTED DestroyString(OwnedString* str)
   {
     // Stack memory will be freed automatically, we need to call
     // destructor explicitly however.
     str->~OwnedString();
   }
 
   String::size_type BINDINGS_EXPORTED GetStringLength(
       const String& str)
   {
     return str.length();
   }
 
   const String::value_type* BINDINGS_EXPORTED GetStringData(
       const String& str)
   {
     return str.data();
   }
 
   void BINDINGS_EXPORTED ReleaseRef(ref_counted* ptr)
   {
     ptr->ReleaseRef();
   }
 }