[PSI, FE, PSI2IR] Use labels for referencing specific receiver

compiler/testData/diagnostics/tests/extensions/contextReceivers/thisWithReceiverLabelsProperties.kt

@@ -0,0 +1,28 @@
+class A<T>(val a: T)
+class B(val b: Any)
+class C(val c: Any)
+
+context(A<Int>, A<String>, B) var p: Int
+    get() {
+        this@A.a.<!UNRESOLVED_REFERENCE!>toDouble<!>()
+        this@A.a.length
+        this@B.b
+        <!NO_THIS!>this<!>
+        return 1
+    }
+    set(value) {
+        this@A.a.length
+        this@B.b
+        <!NO_THIS!>this<!>
+        <!UNRESOLVED_REFERENCE!>field<!> = value
+    }
+
+context(A<Int>, A<String>, B) val C.p: Int
+    get() {
+        this@A.a.length
+        this@B.b
+        this@C.c
+        this@p.c
+        this.c
+        return 1
+    }