Pin new dependency: github.com/google/cel-go v0.9.0

vendor/github.com/google/cel-go/interpreter/coster.go

@@ -0,0 +1,31 @@
+// Copyright 2020 Google LLC
+//
+// Licensed under the Apache License, Version 2.0 (the "License");
+// you may not use this file except in compliance with the License.
+// You may obtain a copy of the License at
+//
+//      http://www.apache.org/licenses/LICENSE-2.0
+//
+// Unless required by applicable law or agreed to in writing, software
+// distributed under the License is distributed on an "AS IS" BASIS,
+// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+// See the License for the specific language governing permissions and
+// limitations under the License.
+
+package interpreter
+
+import "math"
+
+// Coster calculates the heuristic cost incurred during evaluation.
+type Coster interface {
+	Cost() (min, max int64)
+}
+
+// estimateCost returns the heuristic cost interval for the program.
+func estimateCost(i interface{}) (min, max int64) {
+	c, ok := i.(Coster)
+	if !ok {
+		return 0, math.MaxInt64
+	}
+	return c.Cost()
+}