Clean up: use across-decl comparison comparing interface.

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Carbon Language's main repository: documents, design, implementation, and related tools. (NOTE: Carbon Language is experimental; see README)

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Clean up: use across-decl comparison comparing interface. #4195

Closed zygoloid closed 3 months ago

zygoloid commented 3 months ago

This doesn't seem to be observable because we don't support parameterized impls. But it's consistent with how we compare the type portion of the impl.