Fix failure in RunWasmInterpreted_LoadMemI32_const_oob_misaligned on architecures that don't support unaligned access

BUG=cctest/test-run-wasm/RunWasmInterpreted_LoadMemI32_const_oob_misaligned

Review-Url: https://codereview.chromium.org/2026553002
Cr-Commit-Position: refs/heads/master@{#36590}