Now that WebAssembly code has moved off the garbage collected heap, it
is no longer subject to relocation and support for updating the base
address for the purposes of trap handling can be removed.

R=eholk@chromium.org
BUG=v8:7549

Change-Id: I7a98f192e0c91274fa2ccdb59cdd106da6217948
Reviewed-on: https://chromium-review.googlesource.com/978248Reviewed-by: Eric Holk <eholk@chromium.org>
Commit-Queue: Michael Starzinger <mstarzinger@chromium.org>
Cr-Commit-Position: refs/heads/master@{#52207}