This reverts commit 596e56868d.
Reason for revert: Breaks JetStream2 on perf bots.
Original change's description:
> [turboshaft] Implement structural optimization reducer
>
> This CL adds a new Turboshaft reducer that is suitable for changing the
> graph in a way that doesn't reduce individual operations, rather changes
> the structure of the graph. The first such reduction we support is
> transforming if-else cascades that check if a given value is equal to
> any constant from a given set into a switch with cases corresponding to
> the constants in the set.
>
> Bug: v8:12783
> Change-Id: Iee1e5581a334c3dc255d673d2178f76706e6dae2
> Reviewed-on: https://chromium-review.googlesource.com/c/v8/v8/+/4106752
> Commit-Queue: Maya Lekova <mslekova@chromium.org>
> Reviewed-by: Tobias Tebbi <tebbi@chromium.org>
> Reviewed-by: Clemens Backes <clemensb@chromium.org>
> Cr-Commit-Position: refs/heads/main@{#85561}
Bug: v8:12783
Change-Id: Ic9ded7f4e18258346f547600cb541b2fa094fb8d
No-Presubmit: true
No-Tree-Checks: true
No-Try: true
Reviewed-on: https://chromium-review.googlesource.com/c/v8/v8/+/4210088
Commit-Queue: Clemens Backes <clemensb@chromium.org>
Auto-Submit: Maya Lekova <mslekova@chromium.org>
Bot-Commit: Rubber Stamper <rubber-stamper@appspot.gserviceaccount.com>
Reviewed-by: Clemens Backes <clemensb@chromium.org>
Cr-Commit-Position: refs/heads/main@{#85566}
8ce2c87338