[FIR] Keep vararg argument order in resolved calls (KT-17691).

compiler/testData/codegen/box/increment/classVarargGetSetEvaluationOrder.kt

@@ -0,0 +1,41 @@
+// IGNORE_BACKEND_FIR: JVM_IR
+// Currently fails as the indices (`va`) are evaluated twice (on get and set).
+var log = ""
+
+fun logged(value: String) =
+    value.also { log += value }
+
+object A {
+    var x = ""
+    var gets = ""
+    var sets = ""
+
+    operator fun get(vararg va: String): String {
+        for (s in va) {
+            gets += s
+        }
+        log += "get;"
+        return x
+    }
+
+    operator fun set(vararg va: String, value: String) {
+        for (s in va) {
+            sets += s
+        }
+        log += "set;"
+        x = value
+    }
+}
+
+operator fun String.inc() = this + logged("inc;")
+
+fun box(): String {
+    A.x = "start;"
+    val xx = A[logged("1;"), logged("2;"), logged("3;")]++
+    if (xx != "start;") return "Failed xx: $xx"
+    if (A.x != "start;inc;") return "Failed A.x: ${A.x}"
+    if (A.gets != "1;2;3;") return "Failed A.gets: ${A.gets}"
+    if (A.sets != "1;2;3;") return "Failed A.sets: ${A.sets}"
+    if (log != "1;2;3;get;inc;set;") return "Failed log: $log"
+    return "OK"
+}