This change is a documentation update for the execution tracer. Far too
much is left to small comments scattered around places. This change
accumulates the big important trace invariants, with rationale, into one
file: trace.go.
Change-Id: I5fd1402a3d8fdf14a0051e305b3a8fb5dfeafcb3
Reviewed-on: https://go-review.googlesource.com/c/go/+/708398
Auto-Submit: Michael Knyszek <mknyszek@google.com> Reviewed-by: Michael Pratt <mpratt@google.com> Reviewed-by: Cherry Mui <cherryyz@google.com>
LUCI-TryBot-Result: Go LUCI <golang-scoped@luci-project-accounts.iam.gserviceaccount.com>