compiler: don't use pkgpath for fieldtrack of unexported field

Change-Id: I285778c33a0832a3d2a74f3ac14c172f9640fb59
Reviewed-on: https://go-review.googlesource.com/c/gofrontend/+/191040
Reviewed-by: Than McIntosh <thanm@google.com>
Reviewed-by: Cherry Zhang <cherryyz@google.com>
1 file changed