Java: Avoid duplicates for shadowed members in completion list for arguments of reflection calls. Simplify building the list of method names with PsiClass.getVisibleSignatures() (IDEA-167250)

java/java-tests/testData/codeInsight/completion/reflection/ShadowedSuperField.java

@@ -0,0 +1,20 @@
+class Main {
+  void foo() {
+    Test.class.getField("<caret>");
+  }
+}
+
+class Test extends Parent {
+}
+
+class Parent extends Grand {
+  public int shadowed;
+}
+
+class Grand extends GrandGrand {
+  public int shadowed;
+}
+
+class GrandGrand {
+  public int shadowed;
+}