Use scoped_restore_current_language in two places

I found a couple of spots that manually saved and restored the current
language.  This patch changes them to use
scoped_restore_current_language.

Tested by the buildbot.

gdb/ChangeLog
2019-03-23  Tom Tromey  <tom@tromey.com>

	* linespec.c (get_current_search_block): Use
	scoped_restore_current_language.
	* symmisc.c (dump_symtab): Use scoped_restore_current_language.

Author: tromey

gdb/ChangeLog

@@ -1,3 +1,9 @@
+2019-03-23  Tom Tromey  <tom@tromey.com>
+
+	* linespec.c (get_current_search_block): Use
+	scoped_restore_current_language.
+	* symmisc.c (dump_symtab): Use scoped_restore_current_language.
+
 2019-03-22  Alan Hayward  <alan.hayward@arm.com>
 	    Jiong Wang  <jiong.wang@arm.com>
 

gdb/linespec.c

@@ -1190,16 +1190,10 @@ iterate_over_all_matching_symtabs
 static const struct block *
 get_current_search_block (void)
 {
-  const struct block *block;
-  enum language save_language;
-
   /* get_selected_block can change the current language when there is
      no selected frame yet.  */
-  save_language = current_language->la_language;
-  block = get_selected_block (0);
-  set_language (save_language);
-
-  return block;
+  scoped_restore_current_language save_language;
+  return get_selected_block (0);
 }
 
 /* Iterate over static and global blocks.  */

gdb/symmisc.c

@@ -384,13 +384,9 @@ dump_symtab (struct symtab *symtab, struct ui_file *outfile)
   if (symtab->language != language_unknown
       && symtab->language != language_auto)
     {
-      enum language saved_lang;
-
-      saved_lang = set_language (symtab->language);
-
+      scoped_restore_current_language save_lang;
+      set_language (symtab->language);
       dump_symtab_1 (symtab, outfile);
-
-      set_language (saved_lang);
     }
   else
     dump_symtab_1 (symtab, outfile);