[heap] Simplify zapping of old optimized code maps.
This unconditionally enables zapping of old optimized code maps and unifies the various zapping paths. The unconditional zapping, even if heap verification is off, is needed because slots in the code map have not been recorded and evacuation invariants break. R=ulan@chromium.org Review URL: https://codereview.chromium.org/1410833009 Cr-Commit-Position: refs/heads/master@{#31895}
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