MIPS64: Enable shorten-64-to-32 warning.

src/mips64/lithium-codegen-mips64.cc

 // Copyright 2012 the V8 project authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 #include "src/v8.h"
 
 #include "src/code-factory.h"
 #include "src/code-stubs.h"
 #include "src/cpu-profiler.h"
 #include "src/hydrogen-osr.h"
@@ skipping 471 matching lines @@
 }
 
 
 int32_t LCodeGen::ToInteger32(LConstantOperand* op) const {
   // return ToRepresentation(op, Representation::Integer32());
   HConstant* constant = chunk_->LookupConstant(op);
   return constant->Integer32Value();
 }
 
 
-int32_t LCodeGen::ToRepresentation_donotuse(LConstantOperand* op,
-                                   const Representation& r) const {
+int64_t LCodeGen::ToRepresentation_donotuse(LConstantOperand* op,
+                                            const Representation& r) const {
   HConstant* constant = chunk_->LookupConstant(op);
   int32_t value = constant->Integer32Value();
   if (r.IsInteger32()) return value;
   DCHECK(r.IsSmiOrTagged());
   return reinterpret_cast<int64_t>(Smi::FromInt(value));
 }
 
 
 Smi* LCodeGen::ToSmi(LConstantOperand* op) const {
   HConstant* constant = chunk_->LookupConstant(op);
@@ skipping 5574 matching lines @@
   __ Push(at, ToRegister(instr->function()));
   CallRuntime(Runtime::kPushBlockContext, 2, instr);
   RecordSafepoint(Safepoint::kNoLazyDeopt);
 }
 
 
 #undef __
 
 }  // namespace internal
 }  // namespace v8