Removes loads from PP from stubs on arm64.

runtime/vm/runtime_entry_arm64.cc

 // Copyright (c) 2014, the Dart project authors.  Please see the AUTHORS file
 // for details. All rights reserved. Use of this source code is governed by a
 // BSD-style license that can be found in the LICENSE file.
 
 #include "vm/globals.h"
 #if defined(TARGET_ARCH_ARM64)
 
 #include "vm/runtime_entry.h"
 
 #include "vm/assembler.h"
@@ skipping 26 matching lines @@
   entry =
       Simulator::RedirectExternalReference(entry, call_kind, argument_count);
 #endif
   if (is_leaf()) {
     ASSERT(argument_count == this->argument_count());
     ExternalLabel label(name(), entry);
     __ BranchLink(&label, PP);
   } else {
     // Argument count is not checked here, but in the runtime entry for a more
     // informative error message.
-    __ LoadImmediate(R5, entry, PP);
-    __ LoadImmediate(R4, argument_count, PP);
+    __ LoadImmediate(R5, entry, kNoRegister);
+    __ LoadImmediate(R4, argument_count, kNoRegister);
     __ BranchLink(&StubCode::CallToRuntimeLabel(), PP);
   }
 }
 
 }  // namespace dart
 
 #endif  // defined TARGET_ARCH_ARM64