Support when mapping transformation on inlining

compiler/testData/codegen/boxInline/anonymousObject/enumWhen/declSite.kt

@@ -0,0 +1,22 @@
+// FILE: 1.kt
+
+package test
+
+enum class X {
+    A,
+    B
+}
+
+inline fun test(e: X): String {
+    return when(e) {
+        X.A-> "O"
+        X.B-> "K"
+    }
+}
+
+// FILE: 2.kt
+import test.*
+
+fun box(): String {
+    return test(X.A) + test(X.B)
+}