Add crash case crash-30-x64-attempt-to-compute-fragment-before-its-predecessor.c

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,
+  };
+  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_free(insn);
+  }
+  ks_close(ks);
+}