[debug] Only apply TDZ 'value unavailable' logic for let/const
This CL refines https://crrev.com/c/3829539 to only apply to let and const declared variables. `var`s should stay `undefined`. R=jarin@chromium.org Bug: chromium:1328681 Change-Id: I35778c89fb04439348a4f6aebcdeb2db6234f9d0 Reviewed-on: https://chromium-review.googlesource.com/c/v8/v8/+/3848960Reviewed-by:Jaroslav Sevcik <jarin@chromium.org> Commit-Queue: Simon Zünd <szuend@chromium.org> Cr-Commit-Position: refs/heads/main@{#82640}
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