[stdlib] Print a special message when we fail getting a keypath value #72821
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In certain cases,
Valuehas the same layout asValue?and the "nullptr" representation ofValueis represented asnilforValue?. If we're returning aValue, but manage to get itsnilrepresentation, then the above check will fail.This error message isn't too particularly useful just in case we manage to hit it when the above assumption is not correct, but it is a good indicator and gives us a place to look when it does get hit to help diagnose issues.
Resolves: rdar://125367937