[FIR] Fix equality for cfg nodes

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

@@ -102,7 +102,7 @@ sealed class CFGNode<out E : FirElement>(val owner: ControlFlowGraph, val level:
     
     final override fun equals(other: Any?): Boolean {
         if (other !is CFGNode<*>) return false
-        return this.id == other.id
+        return this === other
     }
 
     final override fun hashCode(): Int {

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

@@ -15,6 +15,7 @@ import org.jetbrains.kotlin.fir.resolve.transformers.body.resolve.resultType
 import org.jetbrains.kotlin.fir.symbols.impl.FirCallableSymbol
 import org.jetbrains.kotlin.fir.symbols.impl.FirFunctionSymbol
 import org.jetbrains.kotlin.fir.types.isNothing
+import kotlin.random.Random
 
 class ControlFlowGraphBuilder {
     private val graphs: Stack<ControlFlowGraph> = stackOf(ControlFlowGraph(null, "<TOP_LEVEL_GRAPH>", ControlFlowGraph.Kind.TopLevel))
@@ -60,7 +61,7 @@ class ControlFlowGraphBuilder {
     var levelCounter: Int = 0
         private set
 
-    private var idCounter: Int = 0
+    private var idCounter: Int = Random.nextInt()
     private val shouldPassFlowFromInplaceLambda: Stack<Boolean> = stackOf(true)
 
     fun createId(): Int = idCounter++