Support automatic labeling for infix calls

#KT-8877 Fixed

compiler/testData/diagnostics/tests/labels/automaticLabelFromInfixOperator.kt

@@ -0,0 +1,17 @@
+fun test(x: List<Int>): Int {
+    x myMap {
+        return@myMap
+    }
+
+    return 0
+}
+
+fun myMap(x: List<Int>): Int {
+    x myMap {
+        return<!LABEL_NAME_CLASH!>@myMap<!>
+    }
+
+    return 0
+}
+
+infix fun List<Int>.myMap(<!UNUSED_PARAMETER!>x<!>: () -> Unit) {}