[FE] Do not change original semantics in LabelResolver

compiler/testData/diagnostics/tests/extensions/contextReceivers/noLabelsByClassName.fir.kt

@@ -0,0 +1,27 @@
+fun Int.f() {
+    this<!UNRESOLVED_LABEL!>@Int<!>
+}
+
+var Int.p: Int
+    get() {
+        this<!UNRESOLVED_LABEL!>@Int<!>
+        <!RETURN_NOT_ALLOWED!>return@p<!> 42
+    }
+    set(value) {
+        this<!UNRESOLVED_LABEL!>@Int<!>
+    }
+
+class X {
+    var Int.p: Int
+        get() {
+            this<!UNRESOLVED_LABEL!>@Int<!>
+            <!RETURN_NOT_ALLOWED!>return@p<!> 42
+        }
+        set(value) {
+            this<!UNRESOLVED_LABEL!>@Int<!>
+        }
+
+    fun Int.f() {
+        this<!UNRESOLVED_LABEL!>@Int<!>
+    }
+}

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

@@ -0,0 +1,27 @@
+fun Int.f() {
+    this<!UNRESOLVED_REFERENCE!>@Int<!>
+}
+
+var Int.p: Int
+    get() {
+        this<!UNRESOLVED_REFERENCE!>@Int<!>
+        return<!UNRESOLVED_REFERENCE!>@p<!> 42
+    }
+    set(value) {
+        this<!UNRESOLVED_REFERENCE!>@Int<!>
+    }
+
+class X {
+    var Int.p: Int
+        get() {
+            this<!UNRESOLVED_REFERENCE!>@Int<!>
+            return<!UNRESOLVED_REFERENCE!>@p<!> 42
+        }
+        set(value) {
+            this<!UNRESOLVED_REFERENCE!>@Int<!>
+        }
+
+    fun Int.f() {
+        this<!UNRESOLVED_REFERENCE!>@Int<!>
+    }
+}

compiler/testData/diagnostics/tests/extensions/contextReceivers/noLabelsByClassName.txt

@@ -0,0 +1,13 @@
+package
+
+public var kotlin.Int.p: kotlin.Int
+public fun kotlin.Int.f(): kotlin.Unit
+
+public final class X {
+    public constructor X()
+    public final var kotlin.Int.p: kotlin.Int
+    public open override /*1*/ /*fake_override*/ fun equals(/*0*/ other: kotlin.Any?): kotlin.Boolean
+    public open override /*1*/ /*fake_override*/ fun hashCode(): kotlin.Int
+    public open override /*1*/ /*fake_override*/ fun toString(): kotlin.String
+    public final fun kotlin.Int.f(): kotlin.Unit
+}