Andreas Kling 2f3b901f7f AK: Make MappedFile heap-allocated and ref-counted ...

Let's adapt this class a bit better to how it's actually being used.

Instead of having valid/invalid states and storing an error in case
it's invalid, a MappedFile is now always valid, and the factory
function that creates it will return an OSError if mapping fails.

2021-01-10 16:49:13 +01:00

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