In WasmCode::LogCode we allocate handles, but not all callers of LogCode
open a HandleScope. Since the handles do not escape LogCode, we can just
open a Handlescope in the function.

R=herhut@chromium.org

Bug: v8:8461
Change-Id: I2031b467f976a9af6f541b60af245573f33d9676
Reviewed-on: https://chromium-review.googlesource.com/c/1337736Reviewed-by: Stephan Herhut <herhut@chromium.org>
Commit-Queue: Andreas Haas <ahaas@chromium.org>
Cr-Commit-Position: refs/heads/master@{#57550}