Previously, when parsing a named function expression like
`Oops = function Oops() { Oops }`, the parser set a group-level flag
`might_be_variable_in_lexical_scope_in_named_function_assignment` that
propagated to the parent scope. This incorrectly prevented ALL `Oops`
identifiers from being marked as global, including those outside the
function expression.
Fix this by marking identifiers individually using
`set_is_inside_scope_with_eval()` only for identifiers inside the
function scope. This allows identifiers outside the function expression
to correctly use GetGlobal/SetGlobal while identifiers inside still
use GetBinding (since they may refer to the function's name binding).
