[indic] Remove unused OT_VD category

src/hb-ot-shape-complex-indic-machine.rl

@@ -47,7 +47,6 @@ ZWNJ = 5;
 ZWJ  = 6;
 M    = 7;
 SM   = 8;
-VD   = 9;
 A    = 10;
 PLACEHOLDER = 11;
 DOTTEDCIRCLE = 12;
@@ -67,7 +66,7 @@ cn = c.ZWJ?.n?;
 forced_rakar = ZWJ H ZWJ Ra;
 symbol = Symbol.N?;
 matra_group = z{0,3}.M.N?.(H | forced_rakar)?;
-syllable_tail = (z?.SM.SM?.ZWNJ?)? A{0,3}? VD{0,2};
+syllable_tail = (z?.SM.SM?.ZWNJ?)? A{0,3}?;
 halant_group = (z?.H.(ZWJ.N?)?);
 final_halant_group = halant_group | H.ZWNJ;
 medial_group = CM?;

src/hb-ot-shape-complex-indic-private.hh

@@ -51,7 +51,7 @@ enum indic_category_t {
   OT_ZWJ = 6,
   OT_M = 7,
   OT_SM = 8,
-  OT_VD = 9,
+  /* OT_VD = 9, UNUSED; we use OT_A instead. */
   OT_A = 10,
   OT_PLACEHOLDER = 11,
   OT_DOTTEDCIRCLE = 12,

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

@@ -229,7 +229,7 @@ set_indic_properties (hb_glyph_info_t &info)
   {
     pos = matra_position (u, pos);
   }
-  else if ((FLAG_UNSAFE (cat) & (FLAG (OT_SM) | FLAG (OT_VD) | FLAG (OT_A) | FLAG (OT_Symbol))))
+  else if ((FLAG_UNSAFE (cat) & (FLAG (OT_SM) /* | FLAG (OT_VD) */ | FLAG (OT_A) | FLAG (OT_Symbol))))
   {
     pos = POS_SMVD;
   }