The pass respells `exports.x` and `module.exports.x` through the
exported function's name. A parameter, local, nested function or catch
binding of that name between a respelled read and the top level would
capture it, so the pass now applies only when the file binds the name
once, at its top-level declaration.
`{ exports }` after the rebinding respelled to `{ SemVer }`, which
renames the property; the shorthand now becomes `{ exports: SemVer }`.
Chris Tate
603c6720f9