This reverts commit c2f1090d.

Reason for revert: breaks jumbo build: https://ci.chromium.org/p/v8/builders/luci.v8.ci/V8%20Linux64%20Jumbo%20-%20limited/1309

Original change's description:
> [wasm] Move serialization tests to own file
> 
> Move out all serialization related tests to
> {test-wasm-serialization.cc}, to reduce the size of
> {test-run-wasm-module.cc}.
> 
> R=​titzer@chromium.org
> 
> Bug: v8:7754
> Change-Id: I0b2133baf69e2557df27d1733cc267d1d4cf7452
> Reviewed-on: https://chromium-review.googlesource.com/1107980
> Reviewed-by: Ben Titzer <titzer@chromium.org>
> Commit-Queue: Clemens Hammacher <clemensh@chromium.org>
> Cr-Commit-Position: refs/heads/master@{#53909}

TBR=titzer@chromium.org,clemensh@chromium.org

Change-Id: I2c6ce0c128b34cc28c1f87e02bb584f2a79428e2
No-Presubmit: true
No-Tree-Checks: true
No-Try: true
Bug: v8:7754
Reviewed-on: https://chromium-review.googlesource.com/1109837Reviewed-by: Yang Guo <yangguo@chromium.org>
Commit-Queue: Yang Guo <yangguo@chromium.org>
Cr-Commit-Position: refs/heads/master@{#53914}