Allow to use "static" part of class in own constructors by short name, including in primary constructor

compiler/testData/diagnostics/tests/scopes/classHeader/simpleDelegation.kt

@@ -0,0 +1,10 @@
+// !DIAGNOSTICS: -UNUSED_PARAMETER
+
+interface I
+
+class A : I by impl {
+
+    companion object {
+        val impl = object : I {}
+    }
+}