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

test/cctest/compiler/call-tester.h

Index: test/cctest/compiler/call-tester.h
diff --git a/test/cctest/compiler/call-tester.h b/test/cctest/compiler/call-tester.h
index 30bbe1e8aa1822e87a1ab5a10f714cc2c5fd7730..6d8c76145267a3cfc6fbd94b503b575611de71e2 100644
--- a/test/cctest/compiler/call-tester.h
+++ b/test/cctest/compiler/call-tester.h
@@ -128,6 +128,9 @@ 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 <>
@@ -142,6 +145,9 @@ struct ParameterTraits<uint32_t> {
   }
 };
 
+#endif  // !V8_TARGET_ARCH_64_BIT
+
+
 class CallHelper {
  public:
   explicit CallHelper(Isolate* isolate, MachineSignature* machine_sig)