8263910: Java.extend throws java.lang.ClassFormatError

[szegedi]

Also, don't cache error results anymore; eliminated the whole AdaptationResult/AdaptationException complication. They were only cached for isAutoConvertibleFromFunction, we now cache that flag in a separate class value instead.

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Issue

• JDK-8263910: Java.extend throws java.lang.ClassFormatError

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