target/i386: Simplify TARGET_X86_64 #ifdef'ry

Merge two TARGET_X86_64 consecutive blocks.

Signed-off-by: Philippe Mathieu-Daudé <f4bug@amsat.org>
Reviewed-by: Warner Losh <imp@bsdimp.com>
Reviewed-by: Richard Henderson <richard.henderson@linaro.org>
Message-Id: <20210911165434.531552-4-f4bug@amsat.org>
Signed-off-by: Richard Henderson <richard.henderson@linaro.org>

target/i386/tcg/seg_helper.c

@@ -929,9 +929,7 @@ static void do_interrupt64(CPUX86State *env, int intno, int is_int,
                    e2);
     env->eip = offset;
 }
-#endif
 
-#ifdef TARGET_X86_64
 void helper_sysret(CPUX86State *env, int dflag)
 {
     int cpl, selector;
@@ -984,7 +982,7 @@ void helper_sysret(CPUX86State *env, int dflag)
                                DESC_W_MASK | DESC_A_MASK);
     }
 }
-#endif
+#endif /* TARGET_X86_64 */
 
 /* real mode interrupt */
 static void do_interrupt_real(CPUX86State *env, int intno, int is_int,