Enable sanitization for hash tables.

Enable sanitization for hash tables.

2019-06-07  Martin Liska  <mliska@suse.cz>

	* cselib.c (cselib_init): Disable hash table
	sanitization.
	* hash-set.h: Pass new default argument to m_table.
	* hash-table.c: Add global variable with hash table
	sanitization limit.
	* hash-table.h (Allocator>::hash_table): Add new argument
	to ctor.
	(hashtab_chk_error): New.
	* params.def (PARAM_HASH_TABLE_VERIFICATION_LIMIT): New.
	* toplev.c (process_options): Set hash_table_sanitize_eq_limit
	from the PARAM_HASH_TABLE_VERIFICATION_LIMIT value.

From-SVN: r272038