FIR CFA: align reading of labels with the way they're generated

UncaughtExceptionPath label out of a finally block matches every label
that is not handled by another edge, and a labeled edge from the middle
of a finally block aborts the jump and so should merge all available
data.

compiler/fir/resolve/src/org/jetbrains/kotlin/fir/resolve/dfa/cfg/ControlFlowGraphBuilder.kt

@@ -921,6 +921,8 @@ class ControlFlowGraphBuilder {
         val nextExitLevel = levelOfNextExceptionCatchingGraph()
         val nextFinally = finallyEnterNodes.topOrNull()?.takeIf { it.level > nextExitLevel }
         if (nextFinally != null) {
+            // `PathAwareControlFlowGraphVisitor` has a special case that this path matches any label
+            // that is not otherwise matched by the edges below.
             addEdge(exitNode, nextFinally, label = UncaughtExceptionPath, propagateDeadness = false)
         }
 
@@ -1289,7 +1291,7 @@ class ControlFlowGraphBuilder {
         }
     }
 
-    private fun addBackEdge(from: CFGNode<*>, to: CFGNode<*>, isDead: Boolean = false, label: EdgeLabel = LoopBackPath) {
+    private fun addBackEdge(from: CFGNode<*>, to: CFGNode<*>, isDead: Boolean = false, label: EdgeLabel = NormalPath) {
         val kind = if (isDead || from.isDead || to.isDead) EdgeKind.DeadBackward else EdgeKind.CfgBackward
         CFGNode.addEdge(from, to, kind, propagateDeadness = false, label = label)
     }