PR middle-end/90923 - hash_map destroys elements without constructing them

PR middle-end/90923 - hash_map destroys elements without constructing them

gcc/ChangeLog:

	PR middle-end/90923
	* hash-map.h (hash_map::put): On insertion invoke element ctor.
	(hash_map::get_or_insert): Same.  Reformat comment.
	* hash-set.h (hash_set::add): On insertion invoke element ctor.
	* hash-map-tests.c (test_map_of_type_with_ctor_and_dtor): New.
 	* hash-set-tests.c (test_map_of_type_with_ctor_and_dtor): New.
	* hash-table.h (hash_table::operator=): Prevent copy assignment.
	 (hash_table::hash_table (const hash_table&)): Use copy ctor
	 instead of assignment to copy elements.

From-SVN: r272893