Added a universal 64-bit define, and a message indicating that Pcsx2 was compiled as 64 bit in the system information.

common/include/Pcsx2Defs.h

@@ -241,3 +241,7 @@ static const int __pagesize = PCSX2_PAGESIZE;
 #define __fc __fastcall
 
 #endif
+
+#if defined(__x86_64__) || defined(_M_AMD64)
+#define __M_X86_64
+#endif

pcsx2/System.cpp

@@ -263,6 +263,10 @@ void SysLogMachineCaps()
 
 	Console.WriteLn( Color_StrongBlack,	L"x86 Features Detected:" );
     Console.Indent().WriteLn(result[0] + (result[1].IsEmpty() ? L"" : (L"\n" + result[1])));
+#ifdef __M_X86_64
+    Console.Indent().WriteLn("Pcsx2 was compiled as 64-bits, which is unsupported and breaks all recompilers.");
+#endif
+
 	Console.Newline();
 }