Enable pointer_query caching in -Wrestrict.

Enable pointer_query caching in -Wrestrict.

gcc/ChangeLog:

	* gimple-ssa-warn-restrict.cc (class pass_wrestrict): Outline ctor.
	(pass_wrestrict::m_ptr_qry): New member.
	(wrestrict_walk): Rename...
	(pass_wrestrict::check_block): ...to this.
	(pass_wrestrict::execute): Set up and tear down pointer_query and
	ranger.
	(builtin_memref::builtin_memref): Change ctor argument.  Simplify.
	(builtin_access::builtin_access): Same.
	(builtin_access::m_ptr_qry): New member.
	(check_call): Rename...
	(pass_wrestrict::check_call): ...to this.
	(check_bounds_or_overlap): Change argument.
	* gimple-ssa-warn-restrict.h (check_bounds_or_overlap): Same.