compiler/sem/isolation_check

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Implementation of the check that recover needs, see https://github.com/nim-lang/RFCs/issues/244 for more details.

Procs

proc canAlias(arg, ret: PType): bool {....raises: [Exception, ERecoverableError],
                                       tags: [RootEffect].}
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proc checkIsolate(n: PNode): bool {....raises: [Exception, ERecoverableError],
                                    tags: [RootEffect].}
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