Remove the logical stmt cache for now.

Remove the logical stmt cache for now.

With the depth limiting, we are not currently using the logical stmt cache.

	* gimple-range-gori.cc (class logical_stmt_cache): Delete
	(logical_stmt_cache::logical_stmt_cache ): Delete.
	(logical_stmt_cache::~logical_stmt_cache): Delete.
	(logical_stmt_cache::cache_entry::dump): Delete.
	(logical_stmt_cache::get_range): Delete.
	(logical_stmt_cache::cached_name ): Delete.
	(logical_stmt_cache::same_cached_name): Delete.
	(logical_stmt_cache::cacheable_p): Delete.
	(logical_stmt_cache::slot_diagnostics ): Delete.
	(logical_stmt_cache::dump): Delete.
	(gori_compute_cache::gori_compute_cache): Delete.
	(gori_compute_cache::~gori_compute_cache): Delete.
	(gori_compute_cache::compute_operand_range): Delete.
	(gori_compute_cache::cache_stmt): Delete.
	* gimple-range-gori.h (gori_compute::compute_operand_range): Remove
	virtual.
	(class gori_compute_cache): Delete.