Auto merge of #17791 - bholley:less_verbose_cv, r=heycam
Auto merge of #17791 - bholley:less_verbose_cv, r=heycam

Bring back concise logging for ElementData

This was removed recently in the ComputedValues patch, and makes traversal
logging rather unusable.

Reviewed in https://bugzilla.mozilla.org/show_bug.cgi?id=1382357

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