Convert SwitchCodegen to Kotlin, prettify and optimize codegen

compiler/testData/codegen/bytecodeText/when/exhaustiveWhenInitialization.kt

@@ -9,6 +9,6 @@ fun box(): String {
   return if (b) "OK" else "FAIL"
 }
 
-// 0 TABLESWITCH
-// 1 LOOKUPSWITCH
-// 1 ATHROW
+// 1 TABLESWITCH
+// 0 LOOKUPSWITCH
+// 1 ATHROW

compiler/testData/codegen/bytecodeText/when/exhaustiveWhenReturn.kt

@@ -7,6 +7,6 @@ fun box(): String {
     }
 }
 
-// 0 TABLESWITCH
-// 1 LOOKUPSWITCH
+// 1 TABLESWITCH
+// 0 LOOKUPSWITCH
 // 1 ATHROW

compiler/testData/codegen/bytecodeText/when/integralWhenWithNoInlinedConstants.kt

@@ -12,5 +12,4 @@ fun foo2(x: Int): Boolean {
     }
 }
 
-// 0 TABLESWITCH
-// 2 LOOKUPSWITCH
+// 2 TABLESWITCH

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

@@ -18,4 +18,4 @@ fun box() : String {
     }
 }
 
-// 1 LOOKUPSWITCH
+// 1 TABLESWITCH

compiler/testData/codegen/bytecodeText/whenEnumOptimization/kt14802.kt

@@ -24,4 +24,4 @@ fun box(): String {
     return res
 }
 
-// 1 LOOKUPSWITCH
+// 1 TABLESWITCH

compiler/testData/codegen/bytecodeText/whenEnumOptimization/kt15806.kt

@@ -24,4 +24,4 @@ fun box(): String {
     return "O".doTheThing() + Level.K.doTheThing()
 }
 
-// 1 LOOKUPSWITCH
+// 1 TABLESWITCH