Use object pool for runtime calls.

runtime/vm/assembler_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"  // NOLINT
 #if defined(TARGET_ARCH_ARM64)
 
 #include "vm/assembler.h"
 #include "vm/cpu.h"
 #include "vm/longjump.h"
@@ skipping 1219 matching lines @@
   PopPair(LR, FP);
 }
 
 
 void Assembler::CallRuntime(const RuntimeEntry& entry,
                             intptr_t argument_count) {
   entry.Call(this, argument_count);
 }
 
 
-void Assembler::EnterStubFrame(bool load_pp) {
+void Assembler::EnterStubFrame() {
   EnterFrame(0);
   // Save caller's pool pointer. Push 0 in the saved PC area for stub frames.
   TagAndPushPPAndPcMarker(ZR);
-  if (load_pp) {
-    LoadPoolPointer(PP);
-  }
+  LoadPoolPointer(PP);
 }
 
 
 void Assembler::LeaveStubFrame() {
   // Restore and untag PP.
   LoadFromOffset(PP, FP, kSavedCallerPpSlotFromFp * kWordSize, kNoPP);
   sub(PP, PP, Operand(kHeapObjectTag));
   LeaveFrame();
 }
 
@@ skipping 204 matching lines @@
     add(base, array, Operand(index, LSL, shift));
   }
   const OperandSize size = Address::OperandSizeFor(cid);
   ASSERT(Address::CanHoldOffset(offset, Address::Offset, size));
   return Address(base, offset, Address::Offset, size);
 }
 
 }  // namespace dart
 
 #endif  // defined TARGET_ARCH_ARM64