x/crypto/curve25519,crypto/ed25519: avo doesn't generate go:build lines

[FiloSottile]

Due to mmcloughlin/avo#183, the autogenerated assembly is lacking //go:build lines.

See #41184.

/cc @tklauser

[gopherbot]

Change https://golang.org/cl/319471 mentions this issue: curve25519/internal/field: fix generator module reference to x/crypto

[dmitshur]

CL 338629 updates this issue. CC @mmcloughlin, @josharian, @ianlancetaylor.

@mmcloughlin If updating the generator is a change that needs more time, should we fix it inside the Go tree by adding a temporary "//go:generate gofmt" step to run on the avo-generated files? After the generator is updated to emit gofmt'ed Go code, the extra gofmt invocation can go away. (If updating the generator is equally fast and easy, then of course there's no need for this intermediate step.)

[ianlancetaylor]

According to mmcloughlin/avo#183, this is done for our purposes. Thanks @mmcloughlin .

[gopherbot]

Change https://go.dev/cl/388874 mentions this issue: curve25519/internal/field: update generator to avo v0.4.0