Fix uint8_t/unit32_t mix, always use wordsize access

src/trusted/validator_ragel/unreviewed/validator_x86_64.rl

Index: src/trusted/validator_ragel/unreviewed/validator_x86_64.rl
===================================================================
--- src/trusted/validator_ragel/unreviewed/validator_x86_64.rl	(revision 9487)
+++ src/trusted/validator_ragel/unreviewed/validator_x86_64.rl	(working copy)
@@ -311,8 +311,8 @@
                         const NaClCPUFeaturesX86 *cpu_features,
                         validation_callback_func user_callback,
                         void *callback_data) {
-  uint8_t *valid_targets = BitmapAllocate(size);
-  uint8_t *jump_dests = BitmapAllocate(size);
+  bitmap_word *valid_targets = BitmapAllocate(size);
+  bitmap_word *jump_dests = BitmapAllocate(size);
   const uint8_t *current_position;
   const uint8_t *end_of_bundle;
   int result = TRUE;