ARM64: Enable shorten-64-to-32 warning

test/unittests/compiler/arm64/instruction-selector-arm64-unittest.cc

 // Copyright 2014 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 "test/unittests/compiler/instruction-selector-unittest.h"
 
 namespace v8 {
 namespace internal {
 namespace compiler {
 
@@ skipping 29 matching lines @@
   return os << shift.mi;
 }
 
 
 // Helper to build Int32Constant or Int64Constant depending on the given
 // machine type.
 Node* BuildConstant(InstructionSelectorTest::StreamBuilder& m, MachineType type,
                     int64_t value) {
   switch (type) {
     case kMachInt32:
-      return m.Int32Constant(value);
+      return m.Int32Constant(static_cast<int32_t>(value));
       break;
 
     case kMachInt64:
       return m.Int64Constant(value);
       break;
 
     default:
       UNIMPLEMENTED();
   }
   return NULL;
@@ skipping 2423 matching lines @@
   EXPECT_EQ(kArm64Float64Neg, s[0]->arch_opcode());
   ASSERT_EQ(1U, s[0]->InputCount());
   EXPECT_EQ(s.ToVreg(p0), s.ToVreg(s[0]->InputAt(0)));
   ASSERT_EQ(1U, s[0]->OutputCount());
   EXPECT_EQ(s.ToVreg(n), s.ToVreg(s[0]->Output()));
 }
 
 }  // namespace compiler
 }  // namespace internal
 }  // namespace v8