linker: Remove unnecessary overload of program_resource_visitor::visit_field

It looks like I added this version as a short-hand for users that didn't
need the fuller version.  I don't think there's any real utility in
that.  I'm not sure what my thinking was there.  Maybe if those users
overloaded the recursion function could just call the compact version to
avoid passing some parameters?  None of the users do that.

Either way, having this extra overload is not useful.  Delete it.

Signed-off-by: Ian Romanick <[email protected]>
Reviewed-by: Tapani Pälli <[email protected]>

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