Fix 64-bit atomic operations on 32-bit machines (#19531) (#19532)

Fix 64-bit atomic operations on 32-bit machines (#19531) (#19532)

- Backport #19531
  - Doing 64-bit atomic operations on 32-bit machines is a bit tricky by golang, as they can only be done under certain set of conditions(https://pkg.go.dev/sync/atomic#pkg-note-BUG).
  - This PR fixes such case whereby the conditions weren't met, it moves the int64 to the first field of the struct, which will 64-bit operations happening on this property on 32-bit machines.
  - Resolves #19518