Front-end: Prohibit to create inner class with the same name as a property

compiler/testData/diagnostics/tests/redeclarations/PropertyAndInnerClass.kt

@@ -0,0 +1,13 @@
+public class A() {
+    public val <!REDECLARATION!>FOO<!>: String = "test"
+
+    public class <!REDECLARATION!>FOO<!>() { }
+}
+
+public class B() {
+   class object {
+      public val <!REDECLARATION!>FOO<!>: String = "test"
+      
+      public class <!REDECLARATION!>FOO<!>() { }
+   }
+}