flattenImports used to traverse the transitive closure of all imports by
recursively visiting all imported packages. This is a lot of redundant
work, because flattening happens for every package, the recursion is not
necessary and this change removes the recursion.
Change-Id: Id5a1b3b15ef3ce8e0fc6c945b5484b3dd06bd6b6
Reviewed-on: https://go-review.googlesource.com/c/tools/+/450755
Run-TryBot: Matthew Dempsky <mdempsky@google.com>
gopls-CI: kokoro <noreply+kokoro@google.com>
Reviewed-by: Florian Zenker <floriank@google.com>
Reviewed-by: Matthew Dempsky <mdempsky@google.com>
TryBot-Result: Gopher Robot <gobot@golang.org>
fc702c522d