Fix completing members for receivers shadowed by DslMarker

#KT-20396 Fixed

idea/idea-completion/testData/weighers/basic/UnavailableDslReceiver.Data1.kt

@@ -0,0 +1,6 @@
+package bar
+
+import baz.*
+
+fun B.booExtension() {}
+fun A.booExtensionToA() {}

idea/idea-completion/testData/weighers/basic/UnavailableDslReceiver.kt

@@ -0,0 +1,35 @@
+// RUNTIME
+
+package baz
+
+@DslMarker
+annotation class Marker
+
+@Marker
+class A {
+    val booFromA = ""
+
+    fun booFromA2() {}
+
+    fun section(block: B.() -> Unit) {}
+}
+
+@Marker
+class B {
+    fun booFromB() {}
+}
+
+fun x() {
+    A().apply {
+        section {
+            boo<caret>
+        }
+    }
+
+}
+
+fun booUnrelated() {
+
+}
+
+// ORDER: booFromB, booUnrelated, booleanArrayOf, booExtension