Constify parse_and_eval_type

I noticed that the argumen to parse_and_eval_type could be "const".
This patch implements this change.

I wonder if this could be removed.  It's only called via
check_stub_method_group, which seems questionable to me.  However, I
didn't look into doing this.

gdb/ChangeLog
2020-12-13  Tom Tromey  <tom@tromey.com>

	* gdbtypes.c (safe_parse_type): Make argument const.
	* value.h (parse_and_eval_type): Make argument const.
	* eval.c (parse_and_eval_type): Make argument const.

1 files changed, 1 insertions, 1 deletions

diff --git a/gdb/eval.c b/gdb/eval.c
index 5eb6ce1..3f58769 100644
--- a/gdb/eval.c
+++ b/gdb/eval.c
@@ -3096,7 +3096,7 @@ evaluate_subexp_for_cast (expression *exp, int *pos,
 /* Parse a type expression in the string [P..P+LENGTH).  */
 
 struct type *
-parse_and_eval_type (char *p, int length)
+parse_and_eval_type (const char *p, int length)
 {
   char *tmp = (char *) alloca (length + 4);