[FIR] Fix exponential analysis of augmented array access calls

^KT-50861 Fixed

compiler/testData/diagnostics/tests/operatorsOverloading/plusAssignOnArray.fir.kt

@@ -1,20 +0,0 @@
-// !DIAGNOSTICS: -UNUSED_PARAMETER
-
-class C {
-    operator fun get(i: Int): C = this
-}
-
-operator fun C.plus(a: Any): C = this
-operator fun C.plusAssign(a: Any) {}
-
-class C1 {
-    operator fun get(i: Int): C = C()
-    operator fun set(i: Int, v: C) {}
-}
-
-fun test() {
-    val c = C()
-    c[0] += ""
-    var c1 = C1()
-    c1[0] <!OVERLOAD_RESOLUTION_AMBIGUITY!>+=<!> ""
-}