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IIRC from the e-mail thread, the idea being discussed was to potentially merge the SSA branch immediately after the release (in order to have as much time as possible to test it), so I'd be surprised to find it in this release. There were concerns about the compiler slowdown but I didn't see the end result of the thread.

The SSA changes are not in Go 1.6. They're expected to be in Go 1.7.

The SSA branch is for a future version of Go, possibly Go 1.7.