Fix a JET error regarding the existence of the local variable reducer at a certain point#169

DilumAluthge merged 3 commits intomasterJuliaLang/Distributed.jl:masterfrom

dpa/cherrypick-jet-reducer-local-var-is-definedJuliaLang/Distributed.jl:dpa/cherrypick-jet-reducer-local-var-is-definedCopy head branch name to clipboard