Refactor the process of choosing validators.

src/trusted/validator_x86/ncenuminsts_x86_64.c

Index: src/trusted/validator_x86/ncenuminsts_x86_64.c
diff --git a/src/trusted/validator_x86/ncenuminsts_x86_64.c b/src/trusted/validator_x86/ncenuminsts_x86_64.c
index 2735ba338a2cea048120f1f077bcba6d496ad8e4..722020df416d59d630c0cf35357e753aec43bc35 100644
--- a/src/trusted/validator_x86/ncenuminsts_x86_64.c
+++ b/src/trusted/validator_x86/ncenuminsts_x86_64.c
@@ -161,10 +161,13 @@ Bool NaClSegmentValidates(uint8_t* mbase,
                           NaClPcAddress vbase) {
   NaClCPUFeaturesX86 cpu_features;
   NaClValidationStatus status;
+  /* TODO(pasko): Validator initialization can be slow, make it run only once.
+   */
+  const struct NaClValidatorInterface *validator = NaClCreateValidator();
 
   /* check if NaCl thinks the given code segment is valid. */
   NaClSetAllCPUFeatures(&cpu_features);
-  status = NaCl_ApplyValidator_x86_64(
+  status = validator->Validate(
       vbase, mbase, size,
       /* stubout_mode= */ FALSE, /* readonly_text= */ FALSE, &cpu_features,
       NULL);