This reverts commit 3238162d.

Reason for revert: Speculative revert for https://ci.chromium.org/ui/p/v8/builders/ci/V8%20Linux64/40411/overview, causing SEGV_ACCERR on test/mjsunit/harmony/promise-any-overflow-2.js and other failures in minor_mc variant

Original change's description:
> Reland "[heap] Add epoch to GC tracing events"
>
> This is a reland of be52501d
>
> Fix data race by not emitting the epoch for sweeper background jobs
> at them moment.
>
> Original change's description:
> > [heap] Add epoch to GC tracing events
> >
> > This CL adds the TRACE_GC_EPOCH macro, which adds the epoch as attribute
> > to the trace event. Use TRACE_GC_EPOCH for top-level events, nested
> > events can get the information from its parent.
> >
> > V8's GC needs an epoch for young and full collections, since scavenges
> > also occur during incremental marking. The epoch is also process-wide,
> > so different isolates do not reuse the same id.
> >
> > Change-Id: I8889bccce51e008374b4796445a50062bd87a45d
> > Reviewed-on: https://chromium-review.googlesource.com/c/v8/v8/+/2565247
> > Commit-Queue: Dominik Inführ <dinfuehr@chromium.org>
> > Reviewed-by: Ulan Degenbaev <ulan@chromium.org>
> > Cr-Commit-Position: refs/heads/master@{#71521}
>
> Change-Id: Ib8f4bfdc01c459955eb6db63bb6e24a8aa068f09
> Reviewed-on: https://chromium-review.googlesource.com/c/v8/v8/+/2567702
> Commit-Queue: Dominik Inführ <dinfuehr@chromium.org>
> Reviewed-by: Ulan Degenbaev <ulan@chromium.org>
> Cr-Commit-Position: refs/heads/master@{#71567}

TBR=ulan@chromium.org,dinfuehr@chromium.org

Change-Id: I29a131f798c3536d16e4b4c44c0fcb8b35dd0051
No-Presubmit: true
No-Tree-Checks: true
No-Try: true
Reviewed-on: https://chromium-review.googlesource.com/c/v8/v8/+/2569764Reviewed-by: Maya Lekova <mslekova@chromium.org>
Commit-Queue: Maya Lekova <mslekova@chromium.org>
Cr-Commit-Position: refs/heads/master@{#71569}