[NI] Improve CST algorithm to handle non-fixed variables

#KT-32456 Fixed
 #KT-32423 Fixed
 #KT-32818 Fixed
 #KT-33197 Fixed

compiler/testData/diagnostics/tests/inference/commonSystem/kt33197.kt

@@ -0,0 +1,19 @@
+// !LANGUAGE: +NewInference
+// !DIAGNOSTICS: -UNUSED_EXPRESSION
+
+fun test(condition: Boolean) {
+    val list1 =
+        if (condition) mutableListOf<Int>()
+        else emptyList()
+
+    <!DEBUG_INFO_EXPRESSION_TYPE("kotlin.collections.List<kotlin.Int>")!>list1<!>
+
+    val list2 =
+        if (condition) mutableListOf()
+        else emptyList<Int>()
+
+    <!DEBUG_INFO_EXPRESSION_TYPE("kotlin.collections.List<kotlin.Int>")!>list2<!>
+}
+
+fun <T> mutableListOf(): MutableList<T> = TODO()
+fun <T> emptyList(): List<T> = TODO()