This CL adjusts a DCHECK that verifies a bytecode offset when looking
for the closest breakpoint given that offset. When we pause on
function entry via interrupt, then the offset is
kFunctionEntryBytecodeOffset (-1), which is still a valid offset.

R=jarin@chromium.org

Fixed: chromium:1357554
Change-Id: I5b25b58f02be0e605191c38e9d1d93e334664c63
Reviewed-on: https://chromium-review.googlesource.com/c/v8/v8/+/3862265
Commit-Queue: Simon Zünd <szuend@chromium.org>
Reviewed-by: Jaroslav Sevcik <jarin@chromium.org>
Cr-Commit-Position: refs/heads/main@{#82805}