FIR CFG: merge data flow if called-in-place lambda may not be called

compiler/fir/analysis-tests/testData/resolveWithStdlib/smartcasts/tryWithLambdaInside.dot

@@ -105,8 +105,7 @@ finally {
     14 -> {15};
     15 -> {16};
     16 -> {17};
-    17 -> {31};
-    17 -> {18} [color=red];
+    17 -> {18 31};
     17 -> {31} [style=dashed];
     18 -> {19};
     19 -> {20};
@@ -126,7 +125,7 @@ finally {
     32 -> {33};
     33 -> {34};
     34 -> {35};
-    35 -> {18} [color=green];
+    35 -> {18};
     35 -> {31} [color=green style=dashed];
 
     subgraph cluster_13 {