Refactor the process of choosing validators.

src/trusted/validator/x86/ncval_seg_sfi/ncvalidate.c

 /*
  * Copyright (c) 2012 The Native Client Authors. All rights reserved.
  * Use of this source code is governed by a BSD-style license that can be
  * found in the LICENSE file.
  */
 
 /*
  * ncvalidate.c
  * Validate x86 instructions for Native Client
  *
@@ skipping 992 matching lines @@
 
   old_vstate = NCValidateInit(vbase, sz, FALSE, features);
   if (old_vstate != NULL) {
     NCValidateDStateInit(old_vstate, mbase_old, vbase, sz);
     new_vstate = NCValidateInit(vbase, sz, FALSE, features);
     if (new_vstate != NULL) {
       NCValidateDStateInit(new_vstate, mbase_new, vbase, sz);
 
       NCDecoderStatePairConstruct(&pair,
                                   &old_vstate->dstate,
-                                  &new_vstate->dstate);
+                                  &new_vstate->dstate,
+                                  NULL);  /* copy_func */
       pair.action_fn = ValidateInstReplacement;
       if (NCDecoderStatePairDecode(&pair)) {
         result = 1;
       } else {
         ValidatePrintOffsetError(0, "Replacement not applied!\n", new_vstate);
       }
       if (NCValidateFinish(new_vstate)) {
         /* Errors occurred during validation. */
         result = 0;
       }
@@ skipping 29 matching lines @@
   }
 
   /* check basic block boundaries */
   for (offset = 0; offset < vstate->codesize; offset += vstate->bundle_size) {
     if (!NCGetAdrTable(offset, vstate->vttable)) {
       ValidatePrintOffsetError(offset, "Bad basic block alignment", vstate);
       NCStatsBadAlignment(vstate);
     }
   }
 }