Reapply "Do not directly load smi constants larger than a 16 bit..."

runtime/vm/assembler_mips.h

 // Copyright (c) 2013, 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 VM_ASSEMBLER_MIPS_H_
 #define VM_ASSEMBLER_MIPS_H_
 
 #ifndef VM_ASSEMBLER_H_
 #error Do not include assembler_mips.h directly; use assembler.h instead.
 #endif
 
 #include "platform/assert.h"
 #include "platform/utils.h"
 #include "vm/constants_mips.h"
+#include "vm/object.h"
 #include "vm/simulator.h"
 
 // References to documentation in this file refer to:
 // "MIPS® Architecture For Programmers Volume I-A:
 //   Introduction to the MIPS32® Architecture" in short "VolI-A"
 // and
 // "MIPS® Architecture For Programmers Volume II-A:
 //   The MIPS32® Instruction Set" in short "VolII-A"
 namespace dart {
 
@@ skipping 1095 matching lines @@
   // to this frame.
   void EnterDartFrame(intptr_t frame_size);
   void LeaveDartFrame();
   void LeaveDartFrameAndReturn();
 
   // Set up a Dart frame for a function compiled for on-stack replacement.
   // The frame layout is a normal Dart frame, but the frame is partially set
   // up on entry (it is the frame of the unoptimized code).
   void EnterOsrFrame(intptr_t extra_size);
 
+  // On some other platforms, we draw a distinction between safe and unsafe
+  // smis.
+  static bool IsSafe(const Object& object) { return true; }
+  static bool IsSafeSmi(const Object& object) { return object.IsSmi(); }
+
  private:
   AssemblerBuffer buffer_;
   GrowableObjectArray& object_pool_;  // Objects and patchable jump targets.
   intptr_t prologue_offset_;
 
   const bool use_far_branches_;
   bool delay_slot_available_;
   bool in_delay_slot_;
 
   int32_t AddObject(const Object& obj);
@@ skipping 115 matching lines @@
                                   Register value,
                                   Label* no_update);
 
   DISALLOW_ALLOCATION();
   DISALLOW_COPY_AND_ASSIGN(Assembler);
 };
 
 }  // namespace dart
 
 #endif  // VM_ASSEMBLER_MIPS_H_