FIR CFG: revise edge kind between local func node and fun enter node

so that local function enter node can be visited by FIR CFA

#KT-42814 Fixed

compiler/fir/analysis-tests/testData/resolveWithStdlib/contracts/fromSource/bad/callsInPlace/inLocalFunction.dot

@@ -31,8 +31,7 @@ digraph inLocalFunction_kt {
     }
     0 -> {1};
     1 -> {2};
-    2 -> {3};
+    2 -> {7 3};
-    2 -> {7} [color=red];
     2 -> {7} [style=dashed];
     3 -> {4};
     4 -> {5};

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

@@ -192,7 +192,11 @@ class ControlFlowGraphBuilder {
         }
 
         if (previousNode != null) {
-            addEdge(previousNode, enterNode, preferredKind = EdgeKind.DfgForward)
+            if (localFunctionNode == previousNode) {
+                addEdge(localFunctionNode, enterNode, preferredKind = EdgeKind.Forward)
+            } else {
+                addEdge(previousNode, enterNode, preferredKind = EdgeKind.DfgForward)
+            }
         }
 
         createFunctionExitNode(function).also {

compiler/testData/diagnostics/tests/controlFlowAnalysis/assignedInIfElse.kt

@@ -14,4 +14,8 @@ fun foo(arg: Boolean) {
             x.hashCode()
         }
     }
+
+    fun local(): Int {
+        return x.hashCode()
+    }
 }