introduce variable: suggest method reference expression (IDEA-102852)

java/java-tests/testData/refactoring/introduceVariable/MethodReferenceExpr.after.java

@@ -0,0 +1,9 @@
+class Foo {
+    interface I {
+        Integer[] _(int p);
+    }
+    void test() {
+        I m = Integer[]::new;
+        I i = m;
+    }
+}

java/java-tests/testData/refactoring/introduceVariable/MethodReferenceExpr.java

@@ -0,0 +1,8 @@
+class Foo {
+    interface I {
+        Integer[] _(int p);
+    }
+    void test() {
+        I i = Integer[]:<caret>:new;
+    }
+}