redundant type args: check boxed types if javac would be able to compile (IDEA-53984)

java/java-tests/testData/inspection/redundantTypeArgs/ReturnPrimitiveTypes.java

@@ -0,0 +1,12 @@
+import java.util.*;
+class Test {
+  Map someMap;
+
+  public int getGetBar() {
+    return this.<Integer>getFoo("numberOfConfigurations");
+  }
+
+  protected <T> T getFoo(String key) {
+    return (T)someMap.get(key);
+  }
+}