runtime: duplicate scanobject in greentea and non-greentea files

runtime: duplicate scanobject in greentea and non-greentea files

This change exists to help differentiate profile samples spent on
Green Tea and non-Green-Tea GC time in mixed contexts.

Change-Id: I8dea340d2d11ba4c410ae939fb5f37020d0b55d1
Reviewed-on: https://go-review.googlesource.com/c/go/+/689477
Reviewed-by: Michael Pratt <mpratt@google.com>
Auto-Submit: Michael Knyszek <mknyszek@google.com>
LUCI-TryBot-Result: Go LUCI <golang-scoped@luci-project-accounts.iam.gserviceaccount.com>