The code in TurboAssembler::LoadFromConstantsTable uses special code
to avoid clobbering the scratch register ip by giving different
argument registers to ldr. This used to be motivated by
DirectCEntryStub::GenerateCall relying on LookupConstant not clobbering
ip (see https://crrev.com/c/1070980). Now that this code is gone,
there is no more reason for preserving ip and it's fragile, so it's better
to remove this special handling.

Bug: v8:10077
Change-Id: I683d7c63e2a3c8ba554cd99299206ed9e5df835d
Reviewed-on: https://chromium-review.googlesource.com/c/v8/v8/+/1981160Reviewed-by: Jakob Gruber <jgruber@chromium.org>
Commit-Queue: Tobias Tebbi <tebbi@chromium.org>
Cr-Commit-Position: refs/heads/master@{#65625}