[libspirv] Fix image built-in mangled name (intel#21537)

Combination of 5aa39a7 and 5947c2a caused new fail: Unable to
demangle name: _Z23__spirv_ImageArrayFetchIDv2_cmFETCH_COORD_2_2_c

Author: wenju-he

libclc/libspirv/lib/ptx-nvidiacl/images/image.cl

@@ -4343,7 +4343,7 @@ _CLC_DEFINE_TEXTURE_ARRAY_BINDLESS_THUNK_READS_BUILTIN(half, float, f16,
 #define FETCH_COORD_2_2_j FETCH_COORD_2
 #define FETCH_COORD_2_2_s FETCH_COORD_2
 #define FETCH_COORD_2_2_t FETCH_COORD_2
-#define FETCH_COORD_2_2_a FETCH_COORD_2
+#define FETCH_COORD_2_2_c FETCH_COORD_2
 #define FETCH_COORD_2_2_h FETCH_COORD_2
 #define FETCH_COORD_2_2_f FETCH_COORD_2
 #define FETCH_COORD_2_2_Dh FETCH_COORD_2
@@ -4377,7 +4377,7 @@ _CLC_DEFINE_TEXTURE_ARRAY_BINDLESS_THUNK_READS_BUILTIN(half, float, f16,
 #define WRITE_COLOR_2_2_j WRITE_COLOR(2, j)
 #define WRITE_COLOR_2_2_s WRITE_COLOR(2, s)
 #define WRITE_COLOR_2_2_t WRITE_COLOR(2, t)
-#define WRITE_COLOR_2_2_a WRITE_COLOR(2, a)
+#define WRITE_COLOR_2_2_c WRITE_COLOR(2, c)
 #define WRITE_COLOR_2_2_h WRITE_COLOR(2, h)
 #define WRITE_COLOR_2_2_f WRITE_COLOR(2, f)
 #define WRITE_COLOR_2_2_Dh WRITE_COLOR(2, Dh)
@@ -4466,7 +4466,7 @@ _CLC_DEFINE_IMAGE_ARRAY_BINDLESS_BUILTIN_ALL(half, Dh, f, 16)
 #define READ_COORD_2_2_j READ_COORD_2
 #define READ_COORD_2_2_s READ_COORD_2
 #define READ_COORD_2_2_t READ_COORD_2
-#define READ_COORD_2_2_a READ_COORD_2
+#define READ_COORD_2_2_c READ_COORD_2
 #define READ_COORD_2_2_h READ_COORD_2
 #define READ_COORD_2_2_f S0_ET_T0_T1_i
 #define READ_COORD_2_2_Dh READ_COORD_2