This is the second V8 CL to refactor WebAssembly.instantiateStreaming to
make it spec compliant again. The design doc where the whole change is
discussed is available in the tracking bug. The tracking bug also
references prototype implementations of the whole change, which includes
the changes in this CL.

R=mstarzinger@chromium.org

Bug: chromium:860637
Cq-Include-Trybots: luci.chromium.try:linux_chromium_rel_ng
Change-Id: I776c0f24959ab5663727d3dfee0248a9b0642a42
Reviewed-on: https://chromium-review.googlesource.com/1143187
Commit-Queue: Andreas Haas <ahaas@chromium.org>
Reviewed-by: Michael Starzinger <mstarzinger@chromium.org>
Cr-Commit-Position: refs/heads/master@{#54834}