This reverts commit d7def900.

Reason for revert: Breaks UBSan:
https://ci.chromium.org/p/v8/builders/luci.v8.ci/V8%20Linux64%20UBSan/4542

Besides undefined behavior, things were looking good!


Original change's description:
> Reland "[builtins] [turbofan] Refactor Float64Pow to use single implementation"
> 
> This is a reland of I968a08cef6a6d49350aa79185b2c6fb856d15f23
> 
> Original change's description:
> > [builtins] [turbofan] Refactor Float64Pow to use single implementation
> >
> > Remove platform-specific Float64Pow implementations and utils Pow in
> > favor of a base::ieee754::pow implementation.
> >
> > This unifies the implementation of pow for the compiler, wasm, and
> > runtime.
> >
> > Bug: v8:5848, v8:5086
> > Change-Id: I968a08cef6a6d49350aa79185b2c6fb856d15f23
> > Reviewed-on: https://chromium-review.googlesource.com/c/1403018
> > Commit-Queue: Clemens Hammacher <clemensh@chromium.org>
> > Reviewed-by: Clemens Hammacher <clemensh@chromium.org>
> > Reviewed-by: Georg Neis <neis@chromium.org>
> > Reviewed-by: Yang Guo <yangguo@chromium.org>
> > Reviewed-by: Jaroslav Sevcik <jarin@chromium.org>
> > Cr-Commit-Position: refs/heads/master@{#59229}
> 
> Bug: v8:5848, v8:5086
> Change-Id: I92f22ae03adafd9ad042e8d4bb406cbd5b5fb51e
> Cq-Include-Trybots: luci.chromium.try:linux_chromium_ubsan_rel_ng
> Reviewed-on: https://chromium-review.googlesource.com/c/1447854
> Commit-Queue: Benedikt Meurer <bmeurer@chromium.org>
> Reviewed-by: Benedikt Meurer <bmeurer@chromium.org>
> Reviewed-by: Clemens Hammacher <clemensh@chromium.org>
> Reviewed-by: Georg Neis <neis@chromium.org>
> Cr-Commit-Position: refs/heads/master@{#59411}

TBR=jkummerow@chromium.org,jarin@chromium.org,neis@chromium.org,jgruber@chromium.org,clemensh@chromium.org,bmeurer@chromium.org,me@gus.host

Change-Id: I65c4bbd3ab7aaa1c396d182467c5a1fe6a639df5
No-Presubmit: true
No-Tree-Checks: true
No-Try: true
Bug: v8:5848, v8:5086
Cq-Include-Trybots: luci.chromium.try:linux_chromium_ubsan_rel_ng
Reviewed-on: https://chromium-review.googlesource.com/c/1456107Reviewed-by: Sigurd Schneider <sigurds@chromium.org>
Commit-Queue: Sigurd Schneider <sigurds@chromium.org>
Cr-Commit-Position: refs/heads/master@{#59419}