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fixes #23177
`changeType` doesn't perform range checks to see if the expression fits
the new type [if the old type is the same as the new
type](https://github.com/nim-lang/Nim/blob/62d8ca43063197272968b4acf8c7a1ef27874c54/compiler/semexprs.nim#L633).
For `nkIntLit`, we previously set the type to the concrete base of the
expected type first, then call `changeType`, which works for things like
range types but not bare types of smaller bit size like `int8`. Now we
don't set the type (so the type is nil), and `changeType` performs the
range check when the type is unset (nil).
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