internal/coverage/cfile: remove //go:linkname into testing
This is just looking at a command-line flag. Look directly.
For #67401.
Change-Id: I7a1c3fc2d9cc85e5ffc5731444bf6db87abf6901
Reviewed-on: https://go-review.googlesource.com/c/go/+/585916 Reviewed-by: Than McIntosh <thanm@google.com>
LUCI-TryBot-Result: Go LUCI <golang-scoped@luci-project-accounts.iam.gserviceaccount.com> Reviewed-by: Alan Donovan <adonovan@google.com> Reviewed-by: Cherry Mui <cherryyz@google.com>