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fixes #23998
In `fitNode` the first symbol of a symchoice that expects an enum type
with the same enum type is given as the result of the `fitNode`. But
`getConstExpr` is also called on it, which will return a `nil` node for
nodes that aren't constant but have the enum type, like variables or
proc parameters. Instead we just return the node directly since it's
already typed.
Normally, this `if` branch in `fitNode` shouldn't exist since
`paramTypesMatch` handles it, but the way pure enum symbols work makes
it really impractical to check their ambiguity, which `paramTypesMatch`
won't like. If it causes problems for regular enums we can restrict this
branch to just pure enums until they are hopefully eventually removed.
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