PPC64: [simulator] Do not sign-extend uint32_t call parameters.

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 c75bde1e91b0464751da8173aed13794f190826c..77d2ce1e9512334d00fcc2efd5c6c6914b5e2bb0 100644
--- a/test/cctest/compiler/call-tester.h
+++ b/test/cctest/compiler/call-tester.h
@@ -106,12 +106,14 @@ struct ParameterTraits<int32_t> {
   static int64_t Cast(int32_t r) { return static_cast<int64_t>(r); }
 };
 
+#if !V8_TARGET_ARCH_PPC64
 template <>
 struct ParameterTraits<uint32_t> {
   static int64_t Cast(uint32_t r) {
     return static_cast<int64_t>(static_cast<int32_t>(r));
   }
 };
+#endif
 
 #endif  // !V8_TARGET_ARCH_64_BIT