Add validation caching interface.

src/trusted/validator/x86/ncval_reg_sfi/ncvalidate_iter.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_iter.c
  * Validate x86 instructions for Native Client
  *
@@ skipping 390 matching lines @@
   }
   if (vstate->do_stub_out && (level <= LOG_ERROR)) {
     NaClStubOutInst(vstate, inst2);
   }
 }
 
 Bool NaClValidatorQuit(NaClValidatorState *vstate) {
   return !vstate->validates_ok && (vstate->quit_after_error_count == 0);
 }
 
+Bool NaClValidatorDidStubOut(NaClValidatorState *vstate) {
+  return vstate->did_stub_out;
+}
+
 static void NaClNullErrorPrintInst(NaClErrorReporter* self,
                                    struct NaClInstState* inst) {}
 
 NaClErrorReporter kNaClNullErrorReporter = {
   NaClNullErrorReporter,
   NaClNullErrorPrintf,
   NaClNullErrorPrintfV,
   (NaClPrintInst) NaClNullErrorPrintInst
 };
 
@@ skipping 460 matching lines @@
           "Code modification: code segments have different "
           "number of instructions\n");
     }
   } while (0);
   NaClValidatorStateIterFinish(vstate);
   NaClApplyPostValidators(vstate);
   vstate->cur_iter = NULL;
   NaClInstIterDestroy(iter_old);
   NaClInstIterDestroy(iter_new);
 }