compiler: Lower fn call arg spans down to MIR

To enable improved accuracy of diagnostics in upcoming commits.

Author: Enselic

clippy_lints/src/redundant_clone.rs

@@ -257,9 +257,9 @@ fn is_call_with_ref_arg<'tcx>(
         ..
     } = kind
         && args.len() == 1
-        && let mir::Operand::Move(mir::Place { local, .. }) = &args[0]
+        && let mir::Operand::Move(mir::Place { local, .. }) = &args[0].node
         && let ty::FnDef(def_id, _) = *func.ty(mir, cx.tcx).kind()
-        && let (inner_ty, 1) = walk_ptrs_ty_depth(args[0].ty(mir, cx.tcx))
+        && let (inner_ty, 1) = walk_ptrs_ty_depth(args[0].node.ty(mir, cx.tcx))
         && !is_copy(cx, inner_ty)
     {
         Some((def_id, *local, inner_ty, destination.as_local()?))

clippy_utils/src/mir/possible_borrower.rs

@@ -104,7 +104,7 @@ impl<'a, 'b, 'tcx> mir::visit::Visitor<'tcx> for PossibleBorrowerVisitor<'a, 'b,
             let mut mutable_borrowers = vec![];
 
             for op in args {
-                match op {
+                match &op.node {
                     mir::Operand::Copy(p) | mir::Operand::Move(p) => {
                         if let ty::Ref(_, _, Mutability::Mut) = self.body.local_decls[p.local].ty.kind() {
                             mutable_borrowers.push(p.local);

clippy_utils/src/qualify_min_const_fn.rs

@@ -345,7 +345,7 @@ fn check_terminator<'tcx>(
                 check_operand(tcx, func, span, body)?;
 
                 for arg in args {
-                    check_operand(tcx, arg, span, body)?;
+                    check_operand(tcx, &arg.node, span, body)?;
                 }
                 Ok(())
             } else {