Fix a couple of memory leaks in the C++ frontend

The leak in get_mapped_args is due to auto_vec not properly supporting
destructible elements in that auto_vec's destructor doesn't call the
destructors of its elements.

gcc/cp/ChangeLog:

	* constraint.cc (get_mapped_args): Avoid using auto_vec
	as a vector element.  Release the vectors inside the lists
	vector.
	* parser.c (cp_literal_operator_id): Free the buffer.

gcc/cp/ChangeLog

+2020-01-22  Patrick Palka  <ppalka@redhat.com>
+
+	* constraint.cc (get_mapped_args): Avoid using auto_vec
+	as a vector element.  Release the vectors inside the lists
+	vector.
+	* parser.c (cp_literal_operator_id): Free the buffer.
+
 2020-01-22  Jun Ma  <JunMa@linux.alibaba.com>
 
 	* coroutines.cc (finish_co_await_expr): Add error check on return

gcc/cp/constraint.cc

@@ -2431,7 +2431,7 @@ get_mapped_args (tree map)
      list. Note that the list will be sparse (not all arguments supplied),
      but instantiation is guaranteed to only use the parameters in the
      mapping, so null arguments would never be used.  */
-  auto_vec< auto_vec<tree> > lists (count);
+  auto_vec< vec<tree> > lists (count);
   lists.quick_grow_cleared (count);
   for (tree p = map; p; p = TREE_CHAIN (p))
     {
@@ -2440,7 +2440,7 @@ get_mapped_args (tree map)
       template_parm_level_and_index (TREE_VALUE (p), &level, &index);
 
       /* Insert the argument into its corresponding position.  */
-      auto_vec<tree> &list = lists[level - 1];
+      vec<tree> &list = lists[level - 1];
       if (index >= (int)list.length ())
 	list.safe_grow_cleared (index + 1);
       list[index] = TREE_PURPOSE (p);
@@ -2450,11 +2450,12 @@ get_mapped_args (tree map)
   tree args = make_tree_vec (lists.length ());
   for (unsigned i = 0; i != lists.length (); ++i)
     {
-      auto_vec<tree> &list = lists[i];
+      vec<tree> &list = lists[i];
       tree level = make_tree_vec (list.length ());
       for (unsigned j = 0; j < list.length(); ++j)
 	TREE_VEC_ELT (level, j) = list[j];
       SET_TMPL_ARGS_LEVEL (args, i + 1, level);
+      list.release ();
     }
   SET_NON_DEFAULT_TEMPLATE_ARGS_COUNT (args, 0);
 

gcc/cp/parser.c

@@ -15372,6 +15372,7 @@ cp_literal_operator_id (const char* name)
 			      + strlen (name) + 10);
   sprintf (buffer, UDLIT_OP_ANSI_FORMAT, name);
   identifier = get_identifier (buffer);
+  XDELETEVEC (buffer);
 
   return identifier;
 }