tcg: Remove USE_TCG_OPTIMIZATIONS

This is always defined, and the optimization pass is
essential to producing reasonable code.

Reviewed-by: Philippe Mathieu-Daudé <philmd@linaro.org>
Signed-off-by: Richard Henderson <richard.henderson@linaro.org>

tcg/tcg.c

@@ -22,9 +22,6 @@
  * THE SOFTWARE.
  */
 
-/* define it to use liveness analysis (better code) */
-#define USE_TCG_OPTIMIZATIONS
-
 #include "qemu/osdep.h"
 
 /* Define to jump the ELF file used to communicate with GDB.  */
@@ -6028,9 +6025,7 @@ int tcg_gen_code(TCGContext *s, TranslationBlock *tb, uint64_t pc_start)
     qatomic_set(&prof->opt_time, prof->opt_time - profile_getclock());
 #endif
 
-#ifdef USE_TCG_OPTIMIZATIONS
     tcg_optimize(s);
-#endif
 
 #ifdef CONFIG_PROFILER
     qatomic_set(&prof->opt_time, prof->opt_time + profile_getclock());