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vm_eval.c: Symbol#to_proc and instance_exec

• vm_eval.c (yield_under): should evaluate the proc on the first
  argument. [ruby-core:78839] [Bug #13074]

git-svn-id: svn+ssh://ci.ruby-lang.org/ruby/trunk@57194 b2dd03c8-39d4-4d8f-98ff-823fe69b080e