tcg: Don't make exitreq flag a local temporary

The value is not actually live across basic blocks, so there's no
need for the local property.  This eliminates storing the temporary
to its home location at the branch.
Signed-off-by: NRichard Henderson <rth@twiddle.net>
Reviewed-by: NPeter Maydell <peter.maydell@linaro.org>
Signed-off-by: NAurelien Jarno <aurelien@aurel32.net>

include/exec/gen-icount.h

@@ -15,7 +15,7 @@ static inline void gen_tb_start(void)
     TCGv_i32 flag;
 
     exitreq_label = gen_new_label();
-    flag = tcg_temp_local_new_i32();
+    flag = tcg_temp_new_i32();
     tcg_gen_ld_i32(flag, cpu_env,
                    offsetof(CPUState, tcg_exit_req) - ENV_OFFSET);
     tcg_gen_brcondi_i32(TCG_COND_NE, flag, 0, exitreq_label);