* encoding.c (enc_m_loader): defer finding encoding object not to
	  be infected by marshal source.  [ruby-core:71793] [Bug #11760]

	* marshal.c (r_object0): enable compatible loader on USERDEF
	  class.  the loader function is called with the class itself,
	  instead of an allocated object, and the loaded data.

	* marshal.c (compat_allocator_table): intialize
	  compat_allocator_tbl on demand.

	* object.c (rb_undefined_alloc): extract from rb_obj_alloc.

	* marshal.c (compat_allocator_table): initialize


git-svn-id: svn+ssh://ci.ruby-lang.org/ruby/branches/ruby_2_1@52933 b2dd03c8-39d4-4d8f-98ff-823fe69b080e