The BigInt constructor has quadratic complexity while parsing strings,
and the input is unbounded. Interrupts should be checked during this
operation to ensure the embedder has control over runaway execution.

since the implicit cast from string may now throw.

BigInt: :CompareToString and BigInt::EqualToString now return Maybe<..>
Change-Id: Iccb85fafac4df69075a34d1de647cb4f0184cb12
Reviewed-on: https://chromium-review.googlesource.com/c/v8/v8/+/2392629Reviewed-by: Jakob Kummerow <jkummerow@chromium.org>
Commit-Queue: Jakob Kummerow <jkummerow@chromium.org>
Cr-Commit-Position: refs/heads/master@{#69720}