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"Optimize" Proc#call to not show in backtrace.
MRI 2.3 optimizes Proc#call to not allocate a stack frame and not show up in backtraces. In JRuby, we already did not allocate a frame, so all that was needed was to omit the call from backtrace. See https://bugs.ruby-lang.org/issues/11569 For #3479.