crypto/internal: module asm appears multiple times in workspace

[prattmic]

Running go work init && go work use -r . in the Go repo results in an unusable workspace:

$ go build std
go: module asm appears multiple times in workspace

src/crypto/internal/bigmod/_asm and src/crypto/internal/edwards25519/field/_asm are the two modules named asm. These should probably have unique names to avoid breaking builds.

cc @FiloSottile

---

Context: I don't actually particularly want to use a workspace of all modules in the go repo. I am generating cross-references for https://cs.opensource.google/go, and I want nested modules (like golang.org/x/tools/gopls) included. go work use -r . is a simple way to achieve that, and it seems silly to need a special case for the go repo when we could make this just work.

[gopherbot]

Change https://go.dev/cl/461896 mentions this issue: all: give nested modules fully-qualified names

[gopherbot]

Change https://go.dev/cl/461942 mentions this issue: go/expect: remove invalid characters from test module path