Update Proc to match methods spec

Author: bjfish

spec/tags/truffle/methods_tags.txt

@@ -53,13 +53,6 @@ fails:Public methods on Mutex should not include marshal_dump
 fails:Public methods on Thread should not include freeze
 fails:Public methods on Thread should include add_trace_func
 fails:Public methods on Thread should include set_trace_func
-fails:Public methods on Proc should not include block
-fails:Public methods on Proc should not include block=
-fails:Public methods on Proc should not include bound_method
-fails:Public methods on Proc should not include bound_method=
-fails:Public methods on Proc should not include ruby_method
-fails:Public methods on Proc should not include ruby_method=
-fails:Public methods on Proc should include hash
 fails:Public methods on MatchData should include hash
 fails:Public methods on Method should include clone
 fails:Public methods on Method should include original_name

src/main/ruby/truffleruby/core/proc.rb

@@ -35,10 +35,7 @@
 # OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
 
 class Proc
-  attr_accessor :block
-  attr_accessor :bound_method
-  attr_accessor :ruby_method
-
+  alias_method :hash, :hash
   alias_method :===, :call
 
   def curry(curried_arity = nil)