[Serialization] Minor ModuleFile/ModuleFileSharedCore improvements

* Add properties to ModuleFile which holds information from the control
  block.
* 'ExtendedValidationInfo' parameter for 'ModuleFileSharedCore::load()'
  cannot be 'nullptr'. Make it non-defaulted Rvalue reference.

lib/Serialization/ModuleFile.cpp

@@ -357,7 +357,7 @@ ModuleFile::getModuleName(ASTContext &Ctx, StringRef modulePath,
                       nullptr,
                       nullptr,
                       /*isFramework*/isFramework, loadedModuleFile,
-                      &ExtInfo);
+                      ExtInfo);
   Name = loadedModuleFile->Name.str();
   return std::move(moduleBuf.get());
 }