Port c1d01aea

Fix a few failures which occur because instruction cache
hasn't been flushed after update of WASM references.

BUG=mjsunit/wasm/asm-wasm-heap,mjsunit/wasm/start-function

Review-Url: https://codereview.chromium.org/2103093003
Cr-Commit-Position: refs/heads/master@{#37364}