[swift-build-dev] Using the update-checkout branch scheme facility

[Tim Hawkins]

I'm trying to work out how to use the  --scheme BRANCH-SCHEME
command on update-checkout

In particular i'm trying to build  swift-3.1-branch version of swift.

1)  Does anybody have a sample of the syntax, --help is somewhat vauge
2)  What are the repo/branch maps required for the 3.1 build?
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