cmd/compile: remove conditional code dealing with two export formats This removes some scaffolding introduced pre-1.7, introduced to fix an export format bug, and to minimize conflicts with older formats. The currently deployed and recognized format is "v1", so don't worry about other versions. This is a step towards a better scheme for internal export format versioning. For #16244. Change-Id: Ic7cf99dd2a24ad5484cc54aed44fa09332c2cf72 Reviewed-on: https://go-review.googlesource.com/27205 Reviewed-by: Matthew Dempsky <mdempsky@google.com> Run-TryBot: Robert Griesemer <gri@golang.org>
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