Remove special CheckEquals function for intptr_t on X64 platform.

src/checks.h

Index: src/checks.h
===================================================================
--- src/checks.h	(revision 2841)
+++ src/checks.h	(working copy)
@@ -95,39 +95,7 @@
   }
 }
 
-#ifdef V8_TARGET_ARCH_X64
-// Helper function used by the CHECK_EQ function when given intptr_t
-// arguments.  Should not be called directly.
-static inline void CheckEqualsHelper(const char* file,
-                                     int line,
-                                     const char* expected_source,
-                                     intptr_t expected,
-                                     const char* value_source,
-                                     intptr_t value) {
-  if (expected != value) {
-    V8_Fatal(file, line,
-             "CHECK_EQ(%s, %s) failed\n#   Expected: %i\n#   Found: %i",
-             expected_source, value_source, expected, value);
-  }
-}
 
-
-// Helper function used by the CHECK_NE function when given intptr_t
-// arguments.  Should not be called directly.
-static inline void CheckNonEqualsHelper(const char* file,
-                                        int line,
-                                        const char* unexpected_source,
-                                        intptr_t unexpected,
-                                        const char* value_source,
-                                        intptr_t value) {
-  if (unexpected == value) {
-    V8_Fatal(file, line, "CHECK_NE(%s, %s) failed\n#   Value: %i",
-             unexpected_source, value_source, value);
-  }
-}
-#endif  // V8_TARGET_ARCH_X64
-
-
 // Helper function used by the CHECK function when given string
 // arguments.  Should not be called directly.
 static inline void CheckEqualsHelper(const char* file,