cmd/gofmt: make gofmt -s simplify slices in presence of dot-imports
A dot-import cannot possibly introduce a `len` function since that function would not be exported (it's lowercase). Furthermore, the existing code already (incorrectly) assumed that there was no other `len` function in another file of the package. Since this has been an ok assumption for years, let's leave it, but remove the dot-import restriction. Fixes #15153. Change-Id: I18fbb27acc5a5668833b4b4aead0cca540862b52 Reviewed-on: https://go-review.googlesource.com/21613Reviewed-by:Alan Donovan <adonovan@google.com> Run-TryBot: Robert Griesemer <gri@golang.org> TryBot-Result: Gobot Gobot <gobot@golang.org>
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