Make ParameterTraits specializations for 32-bit integers valid for all arches.

TEST=
BUG=

Review URL: https://codereview.chromium.org/1031113002

Cr-Commit-Position: refs/heads/master@{#27441}

test/cctest/compiler/call-tester.h

@@ -128,7 +128,6 @@ struct ParameterTraits<T*> {
   static uintptr_t Cast(void* r) { return reinterpret_cast<uintptr_t>(r); }
 };
 
-#if V8_TARGET_ARCH_MIPS64
 // Additional template specialization required for mips64 to sign-extend
 // parameters defined by calling convention.
 template <>
@@ -142,7 +141,6 @@ struct ParameterTraits<uint32_t> {
     return static_cast<int64_t>(static_cast<int32_t>(r));
   }
 };
-#endif
 
 class CallHelper {
  public: