Revert "Prevent overflows for concurrent_start_bytes_ sum"

This reverts commit 50b04451431c648a36d2b0f84d728c1ecaf8b71b.

Reason for revert: Broke tests (debug-gc, gss, ss).

Bug: 123772350
Change-Id: I3c7948b966f7e051e26b470cda5f6e5cb387ff54
2 files changed