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/afterGetOrDefaultAssignment.java

@@ -0,0 +1,12 @@
+// "Replace with 'getOrDefault' method call" "true"
+import java.util.Map;
+
+public class Main {
+
+  public void testGetOrDefault(Map<String, String> map, String key) {
+    Integer num = 123;
+    System.out.println(num);
+      num = map.getOrDefault(key, 0);
+      System.out.println(num);
+  }
+}