Improve instruction scheduling when calling the store buffer stub.

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 891 matching lines @@
   }
   // A store buffer update is required.
   if (value != R0) {
     // Preserve R0.
     Push(R0);
   }
   Push(LR);
   if (object != R0) {
     mov(R0, object);
   }
+  ldr(TMP, Address(THR, Thread::update_store_buffer_entry_point_offset()));
   ldr(CODE_REG, Address(THR, Thread::update_store_buffer_code_offset()));
-  ldr(TMP, Address(THR, Thread::update_store_buffer_entry_point_offset()));
   blr(TMP);
   Pop(LR);
   if (value != R0) {
     // Restore R0.
     Pop(R0);
   }
   Bind(&done);
 }
 
 
@@ skipping 647 matching lines @@
   str(tmp, Address(addr, 7), kUnsignedByte);
   if (sz == kDoubleWord) {
     return;
   }
   UNIMPLEMENTED();
 }
 
 }  // namespace dart
 
 #endif  // defined TARGET_ARCH_ARM64