[release-branch.go1.15] cmd/addr2line: don't assume that GOROOT_FINAL is clean
Updates #41447
Fixes #41453
Change-Id: I4460c1c7962d02c41622a5ea1a3c4bc3714a1873
Reviewed-on: https://go-review.googlesource.com/c/go/+/255477
Trust: Bryan C. Mills <bcmills@google.com>
Run-TryBot: Bryan C. Mills <bcmills@google.com>
TryBot-Result: Go Bot <gobot@golang.org>
Reviewed-by: Ian Lance Taylor <iant@golang.org>
(cherry picked from commit
6796a7fb127676b61375339076ae1c982a721dde)
Reviewed-on: https://go-review.googlesource.com/c/go/+/255658