[pushed] Fix build bug in ada-lang.c

[pushed] Fix build bug in ada-lang.c

[Tom Tromey]

An earlier patch of mine introduced a build failure in ada-lang.c.  A
couple of "to_string" calls were not namespace-qualified.  In the
failing setup, the std string_view is being used, and so (apparently)
ADL doesn't find gdb::to_string.

This patch, from the bug, fixes the problem.

gdb/ChangeLog
2021-03-06  Chernov Sergey  <klen_s@mail.ru>

	PR gdb/27528:
	* ada-lang.c (ada_fold_name): Use gdb::to_string.
---
 gdb/ChangeLog  | 5 +++++
 gdb/ada-lang.c | 4 ++--
 2 files changed, 7 insertions(+), 2 deletions(-)

diff --git a/gdb/ada-lang.c b/gdb/ada-lang.c
index bb50222f81c..8f27f3ccdf0 100644
--- a/gdb/ada-lang.c
+++ b/gdb/ada-lang.c
@@ -944,10 +944,10 @@ ada_fold_name (gdb::string_view name)
   static std::string fold_storage;
 
   if (!name.empty () && name[0] == '\'')
-    fold_storage = to_string (name.substr (1, name.size () - 2));
+    fold_storage = gdb::to_string (name.substr (1, name.size () - 2));
   else
     {
-      fold_storage = to_string (name);
+      fold_storage = gdb::to_string (name);
       for (int i = 0; i < name.size (); i += 1)
 	fold_storage[i] = tolower (fold_storage[i]);
     }
-- 
2.26.2