Remove cachedLocaleData from DecimalFormatSymbols.

Only takes a ~7 microseconds to reconstruct, and aligns this class
closer to upstream. Also dubious if repeatedly reconstructing the
same DFS is a use case worth optimizing for.

before
  Experiment {instrument=runtime, benchmarkMethod=time_instantiation, vm=default, parameters={}}
  Results:
    runtime(ns): min=16011.69, 1st qu.=16011.69, median=16011.69, mean=16011.69, 3rd qu.=16011.69, max=16011.69

after
  Experiment {instrument=runtime, benchmarkMethod=time_instantiation, vm=default, parameters={}}
  Results:
    runtime(ns): min=23865.50, 1st qu.=23865.50, median=23865.50, mean=23865.50, 3rd qu.=23865.50, max=23865.50

Also see upstream commit http://hg.openjdk.java.net/jdk8u/jdk8u/jdk/rev/1d7a6adf499f.

Bug: 31930415
Test: ran CtsLibcoreTests & benchmark
Change-Id: I0966125de1690bd0c14f03b190049e7f6948f402

1 files changed, 30 insertions, 0 deletions

diff --git a/benchmarks/src/benchmarks/regression/DecimalFormatSymbolsBenchmark.java b/benchmarks/src/benchmarks/regression/DecimalFormatSymbolsBenchmark.java
new file mode 100644
index 0000000000..381b9e14b2
--- /dev/null
+++ b/benchmarks/src/benchmarks/regression/DecimalFormatSymbolsBenchmark.java
@@ -0,0 +1,30 @@
+/*
+ * Copyright (C) 2018 The Android Open Source Project
+ *
+ * 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 benchmarks.regression;
+
+import java.text.DecimalFormatSymbols;
+import java.util.Locale;
+
+public class DecimalFormatSymbolsBenchmark {
+
+    private static Locale locale = Locale.getDefault(Locale.Category.FORMAT);
+
+    public void time_instantiation(int reps) {
+        for (int i = 0; i < reps; i++) {
+            new DecimalFormatSymbols(locale);
+        }
+    }
+}