When by enum:

Generate TABLESWITCH/LOOKUPSWITCH bytecode command in case of "when" by enum entries

compiler/testData/codegen/bytecodeText/whenEnumOptimization/functionLiteralInTopLevel.kt

@@ -0,0 +1,22 @@
+import kotlin.test.assertEquals
+
+enum class Season {
+    WINTER
+    SPRING
+    SUMMER
+    AUTUMN
+}
+
+fun foo(x : Season, block : (Season) -> String) = block(x)
+
+fun box() : String {
+    return foo(Season.SPRING) {
+        x -> when (x) {
+            Season.SPRING -> "OK"
+            else -> "fail"
+        }
+    }
+}
+
+// 1 LOOKUPSWITCH
+// 1 @_DefaultPackage-functionLiteralInTopLevel-[a-z0-9]+\$WhenMappings.class