!fixup [K/N] DataFlowAnalysis abstraction

kotlin-native/backend.native/compiler/ir/backend.native/src/org/jetbrains/kotlin/backend/konan/optimizations/DataFlowAnalysis.kt

diff --git a/kotlin-native/backend.native/compiler/ir/backend.native/src/org/jetbrains/kotlin/backend/konan/optimizations/DataFlowAnalysis.kt b/kotlin-native/backend.native/compiler/ir/backend.native/src/org/jetbrains/kotlin/backend/konan/optimizations/DataFlowAnalysis.kt
index bdac6ac..9399e4f 100644
--- a/kotlin-native/backend.native/compiler/ir/backend.native/src/org/jetbrains/kotlin/backend/konan/optimizations/DataFlowAnalysis.kt
+++ b/kotlin-native/backend.native/compiler/ir/backend.native/src/org/jetbrains/kotlin/backend/konan/optimizations/DataFlowAnalysis.kt
@@ -7,6 +7,7 @@
 
 import org.jetbrains.kotlin.backend.common.ir.isUnconditional
 import org.jetbrains.kotlin.ir.IrElement
+import org.jetbrains.kotlin.ir.expressions.IrBranch
 import org.jetbrains.kotlin.ir.expressions.IrBreak
 import org.jetbrains.kotlin.ir.expressions.IrContinue
 import org.jetbrains.kotlin.ir.expressions.IrDoWhileLoop
@@ -70,6 +71,8 @@
         return resultData
     }
 
+    final override fun visitBranch(branch: IrBranch, data: T): T = error("Should not call this")
+
     override fun visitWhen(expression: IrWhen, data: T): T {
         val conditions = expression.branches.map { it.condition }
         val conditionResults = conditions.fold(listOf<T>()) { acc, next ->
@@ -83,6 +86,9 @@
         return lattice.meetAll(branchResults + elseResult)
     }
 
+    final override fun visitWhileLoop(loop: IrWhileLoop, data: T): T = super.visitWhileLoop(loop, data)
+    final override fun visitDoWhileLoop(loop: IrDoWhileLoop, data: T): T = super.visitDoWhileLoop(loop, data)
+
     override fun visitLoop(loop: IrLoop, data: T): T {
         continuedStates[loop] = lattice.top
         breakedStates[loop] = lattice.top