linux-user/s390x: Rename __SIGNAL_FRAMESIZE to STACK_FRAME_OVERHEAD

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

linux-user/s390x/signal.c

@@ -26,7 +26,8 @@
 #define __NUM_FPRS 16
 #define __NUM_ACRS 16
 
-#define __SIGNAL_FRAMESIZE      160 /* FIXME: 31-bit mode -> 96 */
+/* Minimum stack frame size */
+#define STACK_FRAME_OVERHEAD    160
 
 #define _SIGCONTEXT_NSIG        64
 #define _SIGCONTEXT_NSIG_BPW    64 /* FIXME: 31-bit mode -> 32 */
@@ -63,7 +64,7 @@ typedef struct {
 } target_sigcontext;
 
 typedef struct {
-    uint8_t callee_used_stack[__SIGNAL_FRAMESIZE];
+    uint8_t callee_used_stack[STACK_FRAME_OVERHEAD];
     target_sigcontext sc;
     target_sigregs sregs;
     int signo;
@@ -83,7 +84,7 @@ struct target_ucontext {
 };
 
 typedef struct {
-    uint8_t callee_used_stack[__SIGNAL_FRAMESIZE];
+    uint8_t callee_used_stack[STACK_FRAME_OVERHEAD];
     /*
      * This field is no longer initialized by the kernel, but it's still a part
      * of the ABI.