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compile.c: do not dump unused callinfos

• compile.c (compile_if): rewind callinfo indexes used in
  unreachable paths, to get rid of dumping unused callinfos.
  [ruby-core:86399] [Bug #14553]

git-svn-id: svn+ssh://ci.ruby-lang.org/ruby/trunk@63040 b2dd03c8-39d4-4d8f-98ff-823fe69b080e