Rename internal buffer var use

Part of https://github.com/harfbuzz/harfbuzz/issues/1810

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

@@ -33,7 +33,7 @@
 
 
 /* buffer var allocations */
-#define arabic_shaping_action() complex_var_u8_0() /* arabic shaping action */
+#define arabic_shaping_action() complex_var_u8_auxiliary() /* arabic shaping action */
 
 #define HB_BUFFER_SCRATCH_FLAG_ARABIC_HAS_STCH HB_BUFFER_SCRATCH_FLAG_COMPLEX0
 

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

@@ -119,7 +119,7 @@ data_destroy_hangul (void *data)
 #define isHangulTone(u) (hb_in_range<hb_codepoint_t> ((u), 0x302Eu, 0x302Fu))
 
 /* buffer var allocations */
-#define hangul_shaping_feature() complex_var_u8_0() /* hangul jamo shaping feature */
+#define hangul_shaping_feature() complex_var_u8_auxiliary() /* hangul jamo shaping feature */
 
 static bool
 is_zero_width_char (hb_font_t *font,

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

@@ -33,8 +33,8 @@
 
 
 /* buffer var allocations */
-#define indic_category() complex_var_u8_0() /* indic_category_t */
-#define indic_position() complex_var_u8_1() /* indic_position_t */
+#define indic_category() complex_var_u8_category() /* indic_category_t */
+#define indic_position() complex_var_u8_auxiliary() /* indic_position_t */
 
 
 #define INDIC_TABLE_ELEMENT_TYPE uint16_t

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

@@ -36,7 +36,7 @@
 #include "hb-ot-shape-complex-vowel-constraints.hh"
 
 /* buffer var allocations */
-#define use_category() complex_var_u8_1()
+#define use_category() complex_var_u8_category()
 
 
 /*

src/hb-ot-shape-complex.hh

@@ -35,8 +35,8 @@
 
 
 /* buffer var allocations, used by complex shapers */
-#define complex_var_u8_0()	var2.u8[2]
-#define complex_var_u8_1()	var2.u8[3]
+#define complex_var_u8_category()	var2.u8[2]
+#define complex_var_u8_auxiliary()	var2.u8[3]
 
 
 #define HB_OT_SHAPE_COMPLEX_MAX_COMBINING_MARKS 32