Where is the source code for Swift 5.1.2?

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The swift-5.1-branch is still versioned at 5.1.1 .

I was going to update these branches once swift-5.1-branch and master are open after the holiday break (Swift CI Holiday Schedule - #3 by mishal_shah).

I created two pull requests to update the version:
master - Bumping Swift version number to 5.1.2 by shahmishal · Pull Request #28513 · apple/swift · GitHub
swift-5.1-branch - [5.1] Bumping Swift version number to 5.1.2 by shahmishal · Pull Request #28514 · apple/swift · GitHub

Where did this branch come from? It is not from the swift-5.1-branch or the master .

To resolve the version issue for Swift 5.1.2, we made the fix on top of swift-5.1.2-RELEASE tag and created new toolchains.

Also the swift version string is still being hard coded in the lib/Basic/Version.cpp file.

We hard code the tag info in lib/Basic/Version.cpp to display (swift-5.1.2-RELEASE). This makes it easier for us to know which tag the compiler was built from. However, we don't hard code this in the master or release branch.