re PR middle-end/49905 (Better sanity checking on sprintf src & dest to produce warning for dodgy code ?)

	PR middle-end/49905
	* tree.h (init_attributes): New prototype.
	* attribs.c (init_attributes): No longer static.

	* decl.c (cxx_init_decl_processing): Add alloc_size (1) attribute
	for operator new and operator new [].  Call init_attributes.

	* g++.dg/ext/builtin-object-size3.C: New test.

From-SVN: r177316