[coverage]: nullish coalescing was consuming too many characters

[bcoe]

• Version: *
• Platform: *
• Subsystem: test

What steps will reproduce the bug?

see:

How often does it reproduce? Is there a required condition?

Collect coverage for ??.

What is the expected behavior?

Coverage tracking should terminate at the end of the token after ??.

What do you see instead?

?? keeps consuming until the next block token.

Additional information

This is fixed upstream in v8:

https://chromium-review.googlesource.com/c/v8/v8/+/2576006