TEST=cctest/test-run-wasm-simd/RunWasm_S8x16Concat_turbofan

Change-Id: Ifcc14b57d65d15e5ae8477a05746027356bac547
Reviewed-on: https://chromium-review.googlesource.com/1166909Reviewed-by: Bill Budge <bbudge@chromium.org>
Reviewed-by: Jaroslav Sevcik <jarin@chromium.org>
Commit-Queue: Ivica Bogosavljevic <ibogosavljevic@wavecomp.com>
Cr-Commit-Position: refs/heads/master@{#55012}