Fix basic blocks order for WHEN expression

Merge-request: KT-MR-6833
Merged-by: Vladimir Sukharev <Vladimir.Sukharev@jetbrains.com>

kotlin-native/backend.native/tests/filecheck/when.kt

@@ -0,0 +1,24 @@
+/*
+ * Copyright 2010-2022 JetBrains s.r.o. and Kotlin Programming Language contributors.
+ * Use of this source code is governed by the Apache 2.0 license that can be found in the license/LICENSE.txt file.
+ */
+
+var i = 1
+fun main() {
+    println(when(i) {
+        0 -> 10
+        1 -> 11
+        2 -> 12
+        else -> 13
+    })
+}
+// CHECK-LABEL: define void @"kfun:#main(){}"()
+// CHECK: when_case
+// CHECK: when_next
+// CHECK: when_case1
+// CHECK: when_next2
+// CHECK: when_case3
+// CHECK: when_next4
+// CHECK: when_exit
+// CHECK: call void @"kfun:kotlin.io#println(kotlin.Any?)
+// CHECK: ret void