merge revision(s) 40525,40526,40528,40530: [Backport #8345]

	proc.c: remove unnecessary static function

	* proc.c (proc_lambda): remove and use rb_block_lambda directly
  instead.
	* include/ruby/intern.h (rb_block_lambda): add declaration instead of
	  deprecated rb_f_lambda.

	* proc.c (mproc, mlambda): use frozen core methods instead of plain
	  global methods, so that methods cannot be overridden.
	  [ruby-core:54687] [Bug #8345]

	* vm.c (Init_VM): define proc and lambda on the frozen core object.

	* defs/id.def (predefined): add "idProc".

	* proc.c (mnew, mproc, mlambda): use predefined IDs.

	* vm.c (Init_VM): ditto.


git-svn-id: svn+ssh://ci.ruby-lang.org/ruby/branches/ruby_2_0_0@41394 b2dd03c8-39d4-4d8f-98ff-823fe69b080e