286: Make LOCK legal with all instructions, per the Programmers' Reference Manual.

src/cpu/386_common.c

@@ -426,9 +426,10 @@ x386_common_log(const char *fmt, ...)
 int
 is_lock_legal(uint32_t fetchdat)
 {
-    int legal;
-    fetch_dat_t fetch_dat;
+    int legal = 1;
 
+    if (is386) {
+        fetch_dat_t fetch_dat;
         fetch_dat.fd = fetchdat;
 
         legal = lock_legal[fetch_dat.b[0]];
@@ -463,6 +464,7 @@ is_lock_legal(uint32_t fetchdat)
                 legal = 0;
             break;
         }
+    }
 
     return legal;
 }