PyCQA / astroid / 1738

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Restructure the AST parsing heuristic to always pick the same module

When a file contained a misplaced type annotation, we were retrying the parsing
without type comments support. That second parsing was using the builtin ast module,
but the rest of the tree utilities (the builder and rebuilder) were not aware of the
new parsing module that was used to build the AST nodes a second time.

This commit moves the logic of picking the parsing module and the corresponding
AST node mapping in a single place, which can be used by both the builder
and the rebuilder.

Close PyCQA/pylint#3540
Close #773

52 of 52 new or added lines in 3 files covered. (100.0%)

7637 of 8445 relevant lines covered (90.43%)

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