Java: Don't cast the argument to generic type because we already know that the actual type is assignable to it (IDEA-171284)

java/java-tests/testData/refactoring/extractMethod/AvoidGenericArgumentCast.java

@@ -0,0 +1,10 @@
+class C {
+    <K> void f(K k) {
+        <selection>System.out.println(k);</selection>
+    }
+
+    void g() {
+        Object o = "";
+        System.out.println(o);
+    }
+}