* bignum.c (rb_big_hash): make it public function to be available in
	  other source files, and remove documentation comment for Bignum#hash.

	* bignum.c (Bignum#hash): remove its definition because it is unified
	  with Object#hash.

	* include/ruby/intern.h (rb_big_hash): add a prototype declaration.

	* hash.c (any_hash): treat Bignum values directly.


git-svn-id: svn+ssh://ci.ruby-lang.org/ruby/branches/ruby_2_3@55633 b2dd03c8-39d4-4d8f-98ff-823fe69b080e