benchmark for symbol block passing

git-svn-id: svn+ssh://ci.ruby-lang.org/ruby/trunk@51968 b2dd03c8-39d4-4d8f-98ff-823fe69b080e

benchmark/bm_vm2_symbol_block_pass.rb

@@ -0,0 +1,3 @@
+class C; 1000.times{|i|eval("def i#{i};end")}; end
+c = C.new; m = C.instance_methods(false)
+1_000.times{m.each{|n|c.tap(&n)}}