Optimize T_ID() macro

This changes the way T_IDs are defined. The T_ID macro was using a integer to pointer cast in
order to provide type safety. This trick disables some compiler optimizations, as explained
here: https://clang.llvm.org/extra/clang-tidy/checks/performance/no-int-to-ptr.html.
Removing the type cast reenables the compiler optimizations.

common/utils/T/T.h

@@ -92,7 +92,11 @@
 struct T_header;
 
 /* to define message ID */
+#ifdef CHECK_T_TYPE
 #define T_ID(x) ((struct T_header *)(uintptr_t)(x))
+#else
+#define T_ID(x) x
+#endif
 
 /* T macro tricks */
 extern int T_stdout;