i965: Rewrite disassembly annotation code

The old code used an array to store each "instruction group" (the new,
better name than the old overloaded "annotation"), and required a
memmove() to shift elements over in the array when we needed to split a
group so that we could add an error message. This was confusing and
difficult to get right, not the least of which was  because the array
has a tail sentinel not included in .ann_count.

Instead use a linked list, a data structure made for efficient
insertion.

Acked-by: Samuel Iglesias Gonsálvez <siglesias@igalia.com>
Reviewed-by: Kenneth Graunke <kenneth@whitecape.org>

src/intel/compiler/brw_eu_validate.c

@@ -1258,7 +1258,7 @@ special_requirements_for_handling_double_precision_data_types(
 bool
 brw_validate_instructions(const struct gen_device_info *devinfo,
                           const void *assembly, int start_offset, int end_offset,
-                          struct annotation_info *annotation)
+                          struct disasm_info *disasm)
 {
    bool valid = true;
 
@@ -1286,8 +1286,8 @@ brw_validate_instructions(const struct gen_device_info *devinfo,
          CHECK(special_requirements_for_handling_double_precision_data_types);
       }
 
-      if (error_msg.str && annotation) {
-         annotation_insert_error(annotation, src_offset, error_msg.str);
+      if (error_msg.str && disasm) {
+         disasm_insert_error(disasm, src_offset, error_msg.str);
       }
       valid = valid && error_msg.len == 0;
       free(error_msg.str);