Javascript interpreter supports for JSC and V8 simultaneously.

Before, one had to build two different versions.

Tools/javascript/v8_shell.cxx

@@ -285,6 +285,6 @@ const char* V8Shell::ToCString(const v8::String::Utf8Value& value) {
   return *value ? *value : "<string conversion failed>";
 }
 
-JSShell* JSShell::Create() {
+JSShell* V8Shell_Create() {
   return new V8Shell();
 }