Java8CollectionsApiInspection & Java8ReplaceMapGetInspection merged into Java8MapApiInspection; support method references in computeIfAbsent

fix for IDEA-163932 Map.get suggested replacement with Map.getOrDefault is misleading

java/java-tests/testData/inspection/java8MapApi/beforeComputeIfAbsentChecked.java

@@ -0,0 +1,21 @@
+// "Replace with 'computeIfAbsent' method call" "false"
+import java.util.ArrayList;
+import java.util.List;
+import java.util.Map;
+
+public class Main {
+  static class MyList extends ArrayList<String> {
+    public MyList() throws Exception {
+
+    }
+  }
+
+  public void testMap(Map<String, List<String>> map, String key, String value) throws Exception {
+    List<String> list = map.get(key);
+    if(list == nul<caret>l) {
+      list = new MyList();
+      map.put(key, list);
+    }
+    list.add(value);
+  }
+}