Support unaligned integer loads on ARM and MIPS.

runtime/vm/assembler_arm64.h

 // 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.
 
 #ifndef RUNTIME_VM_ASSEMBLER_ARM64_H_
 #define RUNTIME_VM_ASSEMBLER_ARM64_H_
 
 #ifndef RUNTIME_VM_ASSEMBLER_H_
 #error Do not include assembler_arm64.h directly; use assembler.h instead.
 #endif
@@ skipping 1383 matching lines @@
                         Register instance,
                         Register end_address,
                         Register temp1,
                         Register temp2);
 
   Address ElementAddressForIntIndex(bool is_external,
                                     intptr_t cid,
                                     intptr_t index_scale,
                                     Register array,
                                     intptr_t index) const;
+  void LoadElementAddressForIntIndex(Register address,
+                                     bool is_external,
+                                     intptr_t cid,
+                                     intptr_t index_scale,
+                                     Register array,
+                                     intptr_t index);
   Address ElementAddressForRegIndex(bool is_load,
                                     bool is_external,
                                     intptr_t cid,
                                     intptr_t index_scale,
                                     Register array,
                                     Register index);
+  void LoadElementAddressForRegIndex(Register address,
+                                     bool is_load,
+                                     bool is_external,
+                                     intptr_t cid,
+                                     intptr_t index_scale,
+                                     Register array,
+                                     Register index);
+
+  void LoadUnaligned(Register dst, Register addr, Register tmp,
+                     OperandSize sz);
+  void StoreUnaligned(Register src, Register addr, Register tmp,
+                      OperandSize sz);
 
  private:
   AssemblerBuffer buffer_;  // Contains position independent code.
 
   ObjectPoolWrapper object_pool_wrapper_;
 
   int32_t prologue_offset_;
 
   bool use_far_branches_;
 
@@ skipping 533 matching lines @@
                                   Register value,
                                   Label* no_update);
 
   DISALLOW_ALLOCATION();
   DISALLOW_COPY_AND_ASSIGN(Assembler);
 };
 
 }  // namespace dart
 
 #endif  // RUNTIME_VM_ASSEMBLER_ARM64_H_