Roll HarfBuzz to 1.4.6

third_party/harfbuzz-ng/src/hb-ot-shape-complex-indic.cc

 /*
  * Copyright © 2011,2012  Google, Inc.
  *
  *  This is part of HarfBuzz, a text shaping library.
  *
  * Permission is hereby granted, without written agreement and without
  * license or royalty fees, to use, copy, modify, and distribute this
  * software and its documentation for any purpose, provided that the
  * above copyright notice and the following two paragraphs appear in
  * all copies of this software.
@@ skipping 1479 matching lines @@
 
     /*       4. If reph should be positioned before post-base consonant, find
      *          first post-base classified consonant not ligated with main. If no
      *          consonant is found, the target position should be before the
      *          first matra, syllable modifier sign or vedic sign.
      */
     /* This is our take on what step 4 is trying to say (and failing, BADLY). */
     if (reph_pos == REPH_POS_AFTER_SUB)
     {
       new_reph_pos = base;
-      while (new_reph_pos < end &&
+      while (new_reph_pos + 1 < end &&
              !( FLAG_SAFE (info[new_reph_pos + 1].indic_position()) & (FLAG (POS_POST_C) | FLAG (POS_AFTER_POST) | FLAG (POS_SMVD))))
         new_reph_pos++;
       if (new_reph_pos < end)
         goto reph_move;
     }
 
     /*       5. If no consonant is found in steps 3 or 4, move reph to a position
      *          immediately before the first post-base matra, syllable modifier
      *          sign or vedic sign that has a reordering class after the intended
      *          reph position. For example, if the reordering position for reph
@@ skipping 300 matching lines @@
   NULL, /* preprocess_text */
   NULL, /* postprocess_glyphs */
   HB_OT_SHAPE_NORMALIZATION_MODE_COMPOSED_DIACRITICS_NO_SHORT_CIRCUIT,
   decompose_indic,
   compose_indic,
   setup_masks_indic,
   NULL, /* disable_otl */
   HB_OT_SHAPE_ZERO_WIDTH_MARKS_NONE,
   false, /* fallback_position */
 };