When by enum:

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

compiler/testData/codegen/boxWithStdlib/whenEnumOptimization/manyWhensWithinClass.kt

@@ -0,0 +1,50 @@
+import kotlin.test.assertEquals
+
+enum class Season {
+    WINTER
+    SPRING
+    SUMMER
+    AUTUMN
+}
+
+class A {
+    public fun bar1(x : Season) : String {
+        when (x) {
+            Season.WINTER, Season.SPRING -> return "winter_spring"
+            Season.SPRING -> return "spring"
+            Season.SUMMER -> return "summer"
+        }
+
+        return "autumn";
+    }
+
+    public fun bar2(y : Season) : String {
+        return bar3(y) { x ->
+            when (x) {
+                Season.WINTER, Season.SPRING -> "winter_spring"
+                Season.SPRING -> "spring"
+                Season.SUMMER -> "summer"
+                else -> "autumn"
+            }
+        }
+    }
+
+    private fun bar3(x : Season, block : (Season) -> String) = block(x)
+}
+
+fun box() : String {
+    val a = A()
+
+    assertEquals("winter_spring", a.bar1(Season.WINTER))
+    assertEquals("winter_spring", a.bar1(Season.SPRING))
+    assertEquals("summer", a.bar1(Season.SUMMER))
+    assertEquals("autumn", a.bar1(Season.AUTUMN))
+
+    assertEquals("winter_spring", a.bar2(Season.WINTER))
+    assertEquals("winter_spring", a.bar2(Season.SPRING))
+    assertEquals("summer", a.bar2(Season.SUMMER))
+    assertEquals("autumn", a.bar2(Season.AUTUMN))
+
+
+    return "OK"
+}