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/afterComputeIfAbsent.java

@@ -0,0 +1,12 @@
+// "Replace with 'computeIfAbsent' method call" "true"
+import java.util.ArrayList;
+import java.util.List;
+import java.util.Map;
+
+public class Main {
+  public void testMap(Map<String, List<String>> map, String key, String value) {
+      List<String> list = map.computeIfAbsent(key, k -> new /*create new ArrayList*/ ArrayList<>());
+      // and put it
+      list.add(value);
+  }
+}