Update bytecode text tests for JVM_IR

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

@@ -1,4 +1,6 @@
 // IGNORE_BACKEND: JVM_IR
+// TODO KT-36840 Don't generate 'throw' clause for statement 'when' in JVM_IR
+
 enum class AccessMode { READ, WRITE, EXECUTE }
 
 fun whenExpr(access: AccessMode) {
@@ -9,11 +11,6 @@ fun whenExpr(access: AccessMode) {
     }
 }
 
-fun box(): String {
-    whenExpr(AccessMode.EXECUTE)
-    return "OK"
-}
-
 // 1 TABLESWITCH
 // 0 LOOKUPSWITCH
 // 0 ATHROW