Minimize crash case.

suite/regress/c-crashers/crash-30-x64-attempt-to-compute-fragment-before-its-predecessor.c

 #include <keystone/keystone.h>
 int main(int argc, char **argv) {
   int ks_arch = KS_ARCH_X86, ks_mode = KS_MODE_64;
-  unsigned char assembly[] = {
-    'I', ';', '.', '=', 'I', '?', ' ', 0x1d, ';', '.',
-    'I', ';', '.', '=', 'I', '?', ' ', ';', ';', '.',
-    '=', 'h', 'w', 'w', ';', '1', '5', ':', 'E', ' ',
-    0x00,
-  };
+  char *assembly = ".=x;.=x;1:";
   ks_engine *ks;
   ks_err err = ks_open(ks_arch, ks_mode, &ks);
   if (!err) {
     size_t count, size;
     unsigned char *insn;
-    ks_asm(ks, (char *)assembly, 0, &insn, &size, &count);
+    ks_asm(ks, assembly, 0, &insn, &size, &count);
     ks_free(insn);
   }
   ks_close(ks);