Make EarlyBinder's inner value private; and fix all of the resulting errors

Author: kylematsuda

clippy_lints/src/multiple_unsafe_ops_per_block.rs

@@ -138,7 +138,7 @@ fn collect_unsafe_exprs<'tcx>(
                     .type_dependent_def_id(expr.hir_id)
                     .map(|def_id| cx.tcx.fn_sig(def_id))
                 {
-                    if sig.0.unsafety() == Unsafety::Unsafe {
+                    if sig.skip_binder().unsafety() == Unsafety::Unsafe {
                         unsafe_ops.push(("unsafe method call occurs here", expr.span));
                     }
                 }