Roll HarfBuzz to 0.9.35

third_party/harfbuzz-ng/src/hb-ot-shape-fallback.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 397 matching lines @@
 
       i = j - 1;
     }
 }
 
 void
 _hb_ot_shape_fallback_position (const hb_ot_shape_plan_t *plan,
                                 hb_font_t *font,
                                 hb_buffer_t  *buffer)
 {
+  _hb_buffer_assert_gsubgpos_vars (buffer);
+
   unsigned int start = 0;
   unsigned int last_cluster = buffer->info[0].cluster;
   unsigned int count = buffer->len;
   for (unsigned int i = 1; i < count; i++)
     if (buffer->info[i].cluster != last_cluster) {
       position_cluster (plan, font, buffer, start, i);
       start = i;
       last_cluster = buffer->info[i].cluster;
     }
   position_cluster (plan, font, buffer, start, count);
@@ skipping 44 matching lines @@
       hb_position_t kern1 = y_kern >> 1;
       hb_position_t kern2 = y_kern - kern1;
       pos[idx].y_advance += kern1;
       pos[skippy_iter.idx].y_advance += kern2;
       pos[skippy_iter.idx].y_offset += kern2;
     }
 
     idx = skippy_iter.idx;
   }
 }