This reverts commit d854d351.

Reason for revert: Speculative revert for webkit unit tests:
https://ci.chromium.org/p/v8/builders/luci.v8.ci/V8-Blink%20Linux%2064/25209

Original change's description:
> [builtins] Clear RelocInfo for off-heap trampolines
> 
> For technical reasons, we used to serialize off-heap trampolines with a
> RelocInfo containing a single OFF_HEAP_TARGET entry. This RelocInfo was
> never needed at runtime. It also ended up being somewhat misleading
> because printing an embedded code object would show the OFF_HEAP_TARGET
> entry (belonging to the trampoline) at the first 'real' instruction.
> 
> With this CL, we explicitly serialize an empty byte array as the reloc
> info for each off-heap trampoline, i.e. the snapshot will never contain
> such off-heap target reloc infos.
> 
> Bug: v8:6666, v8:7969
> Change-Id: If6fa85a438d093ed5dcea07ce0de1db49a224d28
> Reviewed-on: https://chromium-review.googlesource.com/1146643
> Commit-Queue: Jakob Gruber <jgruber@chromium.org>
> Reviewed-by: Yang Guo <yangguo@chromium.org>
> Cr-Commit-Position: refs/heads/master@{#54786}

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

Change-Id: If5eabd162141149361df90095b89a173fe2cb81e
No-Presubmit: true
No-Tree-Checks: true
No-Try: true
Bug: v8:6666, v8:7969
Reviewed-on: https://chromium-review.googlesource.com/1155594Reviewed-by: Michael Achenbach <machenbach@chromium.org>
Commit-Queue: Michael Achenbach <machenbach@chromium.org>
Cr-Commit-Position: refs/heads/master@{#54801}