re PR tree-optimization/64715 (__builtin_object_size (..., 1) fails to locate subobject)

re PR tree-optimization/64715 (__builtin_object_size (..., 1) fails to locate subobject)

	PR tree-optimization/64715
	* passes.def: Add another instance of pass_object_sizes before
	ccp1.
	* tree-object-size.c (pass_object_sizes::execute): In
	first_pass_instance, only handle __bos (, 1) and __bos (, 3)
	calls, and keep the call in the IL, as {MIN,MAX}_EXPR of the
	__bos result and the computed constant.  Remove redundant
	checks, obsoleted by gimple_call_builtin_p test.

	* gcc.dg/builtin-object-size-15.c: New test.
	* gcc.dg/pr64715-1.c: New test.
	* gcc.dg/pr64715-2.c: New test.

From-SVN: r221694