cmd/compile: adjust logopt to attempt to deal with -trimpath

This reverses the operation of -trimpath for URIs emitted
into the logopt json.  If the -trimpath transformation
is not invertible, a bogus and somewhat explanatory path
is prefixed instead.  This should not come up in normal use,
but if it does, the user will get a big pile of bread crumbs.

Fixes #80496.

Change-Id: Ia7c9f3280fe8df72f40b1d18c134f1bbf0528a0b
Reviewed-on: https://go-review.googlesource.com/c/go/+/806961
Reviewed-by: Sean Liao <sean@liao.dev>
Reviewed-by: Cherry Mui <cherryyz@google.com>
LUCI-TryBot-Result: golang-scoped@luci-project-accounts.iam.gserviceaccount.com <golang-scoped@luci-project-accounts.iam.gserviceaccount.com>
Commit-Queue: David Chase <drchase@google.com>
2 files changed
tree: 024f618a959a8b9f87404937a0d3203bb28505be
  1. .github/
  2. api/
  3. doc/
  4. lib/
  5. misc/
  6. src/
  7. test/
  8. .gitattributes
  9. .gitignore
  10. codereview.cfg
  11. CONTRIBUTING.md
  12. go.env
  13. LICENSE
  14. PATENTS
  15. README.md
  16. SECURITY.md
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