[clang] Use -Wshorten-64-to-32 to enable warnings about 64bit to 32bit truncations.

test/cctest/compiler/call-tester.h

 // 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.
 
 #ifndef V8_CCTEST_COMPILER_CALL_TESTER_H_
 #define V8_CCTEST_COMPILER_CALL_TESTER_H_
 
 #include "src/v8.h"
 
 #include "src/simulator.h"
@@ skipping 110 matching lines @@
 template <>
 struct ParameterTraits<int*> {
   static uintptr_t Cast(int* r) { return reinterpret_cast<uintptr_t>(r); }
 };
 
 template <typename T>
 struct ParameterTraits<T*> {
   static uintptr_t Cast(void* r) { return reinterpret_cast<uintptr_t>(r); }
 };
 
+
+#if !V8_TARGET_ARCH_32_BIT
+
 // Additional template specialization required for mips64 to sign-extend
 // parameters defined by calling convention.
 template <>
 struct ParameterTraits<int32_t> {
   static int64_t Cast(int32_t r) { return static_cast<int64_t>(r); }
 };
 
 template <>
 struct ParameterTraits<uint32_t> {
   static int64_t Cast(uint32_t r) {
     return static_cast<int64_t>(static_cast<int32_t>(r));
   }
 };
 
+#endif  // !V8_TARGET_ARCH_64_BIT
+
+
 class CallHelper {
  public:
   explicit CallHelper(Isolate* isolate, MachineSignature* machine_sig)
       : machine_sig_(machine_sig), isolate_(isolate) {
     USE(isolate_);
   }
   virtual ~CallHelper() {}
 
   static MachineSignature* MakeMachineSignature(
       Zone* zone, MachineType return_type, MachineType p0 = kMachNone,
@@ skipping 281 matching lines @@
 
  private:
   CallHelper* helper() { return static_cast<C*>(this); }
 };
 
 }  // namespace compiler
 }  // namespace internal
 }  // namespace v8
 
 #endif  // V8_CCTEST_COMPILER_CALL_TESTER_H_