Port object tests to x64.

runtime/vm/object_arm_test.cc

Index: runtime/vm/object_arm_test.cc
===================================================================
--- runtime/vm/object_arm_test.cc	(revision 1958)
+++ runtime/vm/object_arm_test.cc	(working copy)
@@ -31,17 +31,10 @@
 
 // Generate a dart code sequence that embeds a smi object in it.
 // This is used to test Embedded Smi objects in the instructions.
-void GenerateEmbedSmiInCode(Assembler* assembler, int value) {
+void GenerateEmbedSmiInCode(Assembler* assembler, intptr_t value) {
   __ Unimplemented("GenerateEmbedSmiInCode");
 }
 
-
-// Generate code for a simple static dart function that returns 42.
-// This is used to test invocation of dart functions from C++.
-void GenerateReturn42(Assembler* assembler) {
-  __ Unimplemented("GenerateReturn42");
-}
-
 }  // namespace dart
 
 #endif  // defined TARGET_ARCH_ARM