vla: enable sizeof operator for indirection

This patch enables the sizeof operator for indirections:

1| void foo (size_t n) {
2|   int vla[n];
3|   int *vla_ptr = &vla;
4| }

(gdb) p sizeof(*vla_ptr)

yields sizeof (size_t) * n.

gdb/ChangeLog:

	* eval.c (evaluate_subexp_for_sizeof) <UNOP_IND>: Create an indirect
	value and retrieve the dynamic type size.

1 files changed, 3 insertions, 1 deletions

diff --git a/gdb/eval.c b/gdb/eval.c
index 85523cd..22392eb 100644
--- a/gdb/eval.c
+++ b/gdb/eval.c
@@ -3026,7 +3026,9 @@ evaluate_subexp_for_sizeof (struct expression *exp, int *pos)
 	  && TYPE_CODE (type) != TYPE_CODE_ARRAY)
 	error (_("Attempt to take contents of a non-pointer value."));
       type = TYPE_TARGET_TYPE (type);
-      break;
+      if (is_dynamic_type (type))
+	type = value_type (value_ind (val));
+      return value_from_longest (size_type, (LONGEST) TYPE_LENGTH (type));
 
     case UNOP_MEMVAL:
       (*pos) += 3;