This reverts commit e8d86597.

Reason for revert: crbug.com/981701

Original change's description:
> [parsing] Improve elision of hole checks for default parameters
> 
> Use the position of the next parameter to be declared as the end of the
> initializer for default parameters, so that hole checks can be elided
> for initializers using previous parameters in arrow functions.
> 
> This fixes a source of bytecode mismatches when collecting source
> positions lazily.
> 
> Bug: chromium:980422, v8:8510
> Change-Id: I5ab074231248b661156e7d8e47c01685448b56d5
> Reviewed-on: https://chromium-review.googlesource.com/c/v8/v8/+/1683267
> Reviewed-by: Toon Verwaest <verwaest@chromium.org>
> Commit-Queue: Dan Elphick <delphick@chromium.org>
> Cr-Commit-Position: refs/heads/master@{#62525}

TBR=verwaest@chromium.org,delphick@chromium.org

# Not skipping CQ checks because original CL landed > 1 day ago.

Bug: chromium:980422, v8:8510
Change-Id: I3abd70a1fb00967e58b46177655a0078e24db720
Reviewed-on: https://chromium-review.googlesource.com/c/v8/v8/+/1697242Reviewed-by: Dan Elphick <delphick@chromium.org>
Commit-Queue: Dan Elphick <delphick@chromium.org>
Cr-Commit-Position: refs/heads/master@{#62630}