Clean up const_float_classify leftovers

Author: alex-semenyuk

clippy_lints/src/manual_float_methods.rs

@@ -90,10 +90,7 @@ impl<'tcx> LateLintPass<'tcx> for ManualFloatMethods {
             && let mut exprs = [lhs_lhs, lhs_rhs, rhs_lhs, rhs_rhs]
             && exprs.iter_mut().partition_in_place(|i| path_to_local(i).is_some()) == 2
             && !in_external_macro(cx.sess(), expr.span)
-            && (
-                matches!(cx.tcx.constness(cx.tcx.hir().enclosing_body_owner(expr.hir_id)), Constness::NotConst)
-                    || cx.tcx.features().declared(sym!(const_float_classify))
-            )
+            && matches!(cx.tcx.constness(cx.tcx.hir().enclosing_body_owner(expr.hir_id)), Constness::NotConst)
             && let [first, second, const_1, const_2] = exprs
             && let ecx = ConstEvalCtxt::new(cx)
             && let Some(const_1) = ecx.eval(const_1)

tests/ui/manual_float_methods.rs

@@ -40,7 +40,6 @@ fn main() {
     // Not -inf
     if x != f64::INFINITY && x != fn_test_not_inf() {}
     const X: f64 = 1.0f64;
-    // Will be linted if `const_float_classify` is enabled
     if const { X == f64::INFINITY || X == f64::NEG_INFINITY } {}
     if const { X != f64::INFINITY && X != f64::NEG_INFINITY } {}
     external! {