Enable snapshots on MIPS. This is based on

src/mips/lithium-codegen-mips.cc

 // Copyright 2012 the V8 project authors. All rights reserved.
 // Redistribution and use in source and binary forms, with or without
 // modification, are permitted provided that the following conditions are
 // met:
 //
 //     * Redistributions of source code must retain the above copyright
 //       notice, this list of conditions and the following disclaimer.
 //     * Redistributions in binary form must reproduce the above
 //       copyright notice, this list of conditions and the following
 //       disclaimer in the documentation and/or other materials provided
@@ skipping 2064 matching lines @@
   // root array to force relocation to be able to later patch with
   // the cached map.
   Handle<JSGlobalPropertyCell> cell =
       factory()->NewJSGlobalPropertyCell(factory()->the_hole_value());
   __ li(at, Operand(Handle<Object>(cell)));
   __ lw(at, FieldMemOperand(at, JSGlobalPropertyCell::kValueOffset));
   __ Branch(&cache_miss, ne, map, Operand(at));
   // We use Factory::the_hole_value() on purpose instead of loading from the
   // root array to force relocation to be able to later patch
   // with true or false.
-  __ li(result, Operand(factory()->the_hole_value()), true);
+  __ li(result, Operand(factory()->the_hole_value()), CONSTANT_SIZE);
   __ Branch(&done);
 
   // The inlined call site cache did not match. Check null and string before
   // calling the deferred code.
   __ bind(&cache_miss);
   // Null is not instance of anything.
   __ LoadRoot(temp, Heap::kNullValueRootIndex);
   __ Branch(&false_result, eq, object, Operand(temp));
 
   // String values is not instance of anything.
@@ skipping 34 matching lines @@
   // offset to the location of the map check.
   Register temp = ToRegister(instr->TempAt(0));
   ASSERT(temp.is(t0));
   __ LoadHeapObject(InstanceofStub::right(), instr->function());
   static const int kAdditionalDelta = 7;
   int delta = masm_->InstructionsGeneratedSince(map_check) + kAdditionalDelta;
   Label before_push_delta;
   __ bind(&before_push_delta);
   {
     Assembler::BlockTrampolinePoolScope block_trampoline_pool(masm_);
-    __ li(temp, Operand(delta * kPointerSize), true);
+    __ li(temp, Operand(delta * kPointerSize), CONSTANT_SIZE);
     __ StoreToSafepointRegisterSlot(temp, temp);
   }
   CallCodeGeneric(stub.GetCode(),
                   RelocInfo::CODE_TARGET,
                   instr,
                   RECORD_SAFEPOINT_WITH_REGISTERS_AND_NO_ARGUMENTS);
   ASSERT(instr->HasDeoptimizationEnvironment());
   LEnvironment* env = instr->deoptimization_environment();
   safepoints_.RecordLazyDeoptimizationIndex(env->deoptimization_index());
   // Put the result value into the result register slot and
@@ skipping 2901 matching lines @@
   __ Subu(scratch, result, scratch);
   __ lw(result, FieldMemOperand(scratch,
                                 FixedArray::kHeaderSize - kPointerSize));
   __ bind(&done);
 }
 
 
 #undef __
 
 } }  // namespace v8::internal