[myanmar] Remove myanmar_old shaper

Over time it has become the same as default shaper.  So, remove.

src/hb-ot-shape-complex-myanmar.cc

@@ -391,27 +391,6 @@ const hb_ot_complex_shaper_t _hb_ot_complex_shaper_myanmar =
 };
 
 
-/* Uniscribe seems to have a shaper for 'mymr' that is like the
- * generic shaper, except that it zeros mark advances GDEF_LATE. */
-const hb_ot_complex_shaper_t _hb_ot_complex_shaper_myanmar_old =
-{
-  nullptr, /* collect_features */
-  nullptr, /* override_features */
-  nullptr, /* data_create */
-  nullptr, /* data_destroy */
-  nullptr, /* preprocess_text */
-  nullptr, /* postprocess_glyphs */
-  HB_OT_SHAPE_NORMALIZATION_MODE_DEFAULT,
-  nullptr, /* decompose */
-  nullptr, /* compose */
-  nullptr, /* setup_masks */
-  HB_TAG_NONE, /* gpos_tag */
-  nullptr, /* reorder_marks */
-  HB_OT_SHAPE_ZERO_WIDTH_MARKS_BY_GDEF_LATE,
-  true, /* fallback_position */
-};
-
-
 /* Ugly Zawgyi encoding.
  * Disable all auto processing.
  * https://github.com/harfbuzz/harfbuzz/issues/1162 */

src/hb-ot-shape-complex.hh

@@ -57,7 +57,6 @@ enum hb_ot_shape_zero_width_marks_type_t {
   HB_COMPLEX_SHAPER_IMPLEMENT (indic) \
   HB_COMPLEX_SHAPER_IMPLEMENT (khmer) \
   HB_COMPLEX_SHAPER_IMPLEMENT (myanmar) \
-  HB_COMPLEX_SHAPER_IMPLEMENT (myanmar_old) \
   HB_COMPLEX_SHAPER_IMPLEMENT (myanmar_zawgyi) \
   HB_COMPLEX_SHAPER_IMPLEMENT (thai) \
   HB_COMPLEX_SHAPER_IMPLEMENT (use) \
@@ -271,8 +270,6 @@ hb_ot_shape_complex_categorize (const hb_ot_shape_planner_t *planner)
     case HB_SCRIPT_MYANMAR:
       if (planner->map.chosen_script[0] == HB_TAG ('m','y','m','2'))
 	return &_hb_ot_complex_shaper_myanmar;
-      else if (planner->map.chosen_script[0] == HB_TAG ('m','y','m','r'))
-	return &_hb_ot_complex_shaper_myanmar_old;
       else
 	return &_hb_ot_complex_shaper_default;
 
@@ -378,6 +375,7 @@ hb_ot_shape_complex_categorize (const hb_ot_shape_planner_t *planner)
 
     /* https://github.com/harfbuzz/harfbuzz/issues/1162 */
     case HB_SCRIPT_MYANMAR_ZAWGYI:
+
       return &_hb_ot_complex_shaper_myanmar_zawgyi;
   }
 }