FIR DFA: unwrap transparent expressions in more places

compiler/testData/diagnostics/testsWithStdLib/inference/kt38737.fir.kt

@@ -1,13 +0,0 @@
-private const val dateRangeStart: String = "2020-01-01"
-private const val dateRangeEnd: String = "2020-05-01"
-
-private fun String?.toIconList(): List<String> = when (this) {
-    null -> listOf("DATE_IS_NULL")
-    <!ARGUMENT_TYPE_MISMATCH!>in dateRangeStart..dateRangeEnd<!> -> emptyList()
-    else -> listOf("DATE_IS_OUT_OF_RANGE")
-}
-
-fun main() {
-    println("2019-12-31".toIconList())
-    println(null.toIconList())
-}

compiler/testData/diagnostics/testsWithStdLib/inference/kt38737.kt

@@ -1,3 +1,4 @@
+// FIR_IDENTICAL
 private const val dateRangeStart: String = "2020-01-01"
 private const val dateRangeEnd: String = "2020-05-01"