IDEA-161034 Code completion should be provided for static method references too

java/java-tests/testData/codeInsight/completion/smartType/StaticMethodReference-out.java

@@ -0,0 +1,11 @@
+import java.util.stream.Stream;
+
+class Example {
+  private void example(Stream<String> s) {
+    s.map(Example::method2)<caret>
+  }
+
+  private static String method2(String s) {
+    return s;
+  }
+}

java/java-tests/testData/codeInsight/completion/smartType/StaticMethodReference.java

@@ -0,0 +1,11 @@
+import java.util.stream.Stream;
+
+class Example {
+  private void example(Stream<String> s) {
+    s.map(meth<caret>)
+  }
+
+  private static String method2(String s) {
+    return s;
+  }
+}