This reverts commit 83470dee.

Reason for revert: Introduced inconsistencies with the runtime (https://crbug.com/chromium/1339320) and increased inaccuracy
(https://crbug.com/v8/12996). Even though this is currently not specified, the speed improvement doesn't seem to be worth the
lower precision.

Bug: chromium:1339320, v8:12996

Original change's description:
> [turbofan] Add fast path for Math.pow with small positive integer exponent
>
> For small positive integer exponents, calculate the result with an inlined loop.
>
> This change may improve the average runtime of JetStream2/raytrace for ~8%.
>
> Change-Id: I0e3939dc9c21b0c392c04d61fd197bf618004ab4
> Reviewed-on: https://chromium-review.googlesource.com/c/v8/v8/+/3708024
> Commit-Queue: Fanchen Kong <fanchen.kong@intel.com>
> Reviewed-by: Maya Lekova <mslekova@chromium.org>
> Cr-Commit-Position: refs/heads/main@{#81341}

Change-Id: Idfaa229b3d37a1831f016453c6091d2498cb6bcd
Reviewed-on: https://chromium-review.googlesource.com/c/v8/v8/+/3735129
Commit-Queue: Rubber Stamper <rubber-stamper@appspot.gserviceaccount.com>
Auto-Submit: Maya Lekova <mslekova@chromium.org>
Bot-Commit: Rubber Stamper <rubber-stamper@appspot.gserviceaccount.com>
Cr-Commit-Position: refs/heads/main@{#81463}