This reverts commit da785659.

Reason for revert: Investigating regressions https://chromeperf.appspot.com/group_report?rev=72572

Original change's description:
> [compiler] Don't serialize JSTypedArray fields
>
> This CL removes serialization of JSTypedArray fields when direct heap
> reads are enabled. Invariants we rely on:
>
> - Of the underlying interesting fields,
>   - base_pointer and external_pointer are set either during
>     initialization, or in a one-time on-to-off-heap transition in
>     GetBuffer.
>   - length and buffer are immutable after initialization.
> - is_on_heap and DataPtr derive from base_pointer and
>   external_pointer s.t. is_on_heap == (base_pointer != 0) and
>   DataPtr == external_pointer in the off-heap case.
>
> In this CL we add one new invariant:
>
> - For all base_pointer and external_pointer mutations after
>   initialization, base_pointer is guaranteed to be release-stored
>   after external_pointer has been written.
>
> With these invariants, concurrent access to off-heap typed arrays is
> trivial as long as is_on_heap (= base_pointer) is read before other
> relevant fields.
>
> Note that JSTypedArray remains a kSerializedHeapObject due to the
> serialized superclass JSObject.
>
> Drive-by: Remove unused Torque operators and empty TODOs.
>
> Bug: v8:7790
> Change-Id: I3c4327318f94e4e6083d4e87476069aad2649386
> Cq-Include-Trybots: luci.v8.try:v8_linux64_tsan_isolates_rel_ng
> Cq-Include-Trybots: luci.v8.try:v8_linux64_tsan_rel_ng
> Reviewed-on: https://chromium-review.googlesource.com/c/v8/v8/+/2679689
> Commit-Queue: Jakob Gruber <jgruber@chromium.org>
> Reviewed-by: Georg Neis <neis@chromium.org>
> Cr-Commit-Position: refs/heads/master@{#72572}

TBR=neis@chromium.org,jgruber@chromium.org

Change-Id: I5a7e6bacb7b7a3e3510c778837679e6822f26339
No-Presubmit: true
No-Tree-Checks: true
No-Try: true
Bug: v8:7790
Cq-Include-Trybots: luci.v8.try:v8_linux64_tsan_isolates_rel_ng
Cq-Include-Trybots: luci.v8.try:v8_linux64_tsan_rel_ng
Reviewed-on: https://chromium-review.googlesource.com/c/v8/v8/+/2681948Reviewed-by: Jakob Gruber <jgruber@chromium.org>
Commit-Queue: Jakob Gruber <jgruber@chromium.org>
Cr-Commit-Position: refs/heads/master@{#72583}