Fix the xcode build by not including x64 specific code when generating...

src/x64/lithium-codegen-x64.cc

 // Copyright 2011 the V8 project authors. All rights reserved.
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+#include "v8.h"
+
+#if defined(V8_TARGET_ARCH_X64)
+
 #include "x64/lithium-codegen-x64.h"
 #include "code-stubs.h"
 #include "stub-cache.h"
 
 namespace v8 {
 namespace internal {
 
 
 #define __ masm()->
 
@@ skipping 1080 matching lines @@
 }
 
 
 void LCodeGen::DoOsrEntry(LOsrEntry* instr) {
   Abort("Unimplemented: %s", "DoOsrEntry");
 }
 
 #undef __
 
 } }  // namespace v8::internal
+
+#endif  // V8_TARGET_ARCH_X64