Implement `FileDescriptor.memoryMap`, `FileDescriptor.memoryUnmap`, and `FileDescriptor.memorySync`#68

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jsflax wants to merge 3 commits intoapple:mainfrom

Commits on Nov 7, 2021

Implement `FileDescriptor.memoryMap`, `FileDescriptor.memoryUnmap`, and `FileDescriptor.memorySync`
jsflax
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Set `valueOnSuccess` for CInt/Int/_COffT mock methods to 0
jsflax
committed
Remove `MemorySyncKind.invalidated` field covered by `invalidateOtherMappings` parameter in `memorySync`
jsflax
committed