Fix use-after-free printing the name of an interface that might have been invalidated by lazy import.

carbon-language / carbon-lang

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Fix use-after-free printing the name of an interface that might have been invalidated by lazy import. #4509

Closed zygoloid closed 2 weeks ago

zygoloid commented 2 weeks ago

While here, also change the diagnostic emission to pass the interface type rather than the interface name. This prepares us to include the arguments in the diagnostic.