FIR DFA: take all statements from ?. if result is non-null.

I.e. a?.f(b as T) != null => b is T.

This also allows to remove the copyAllInformationFrom hack by moving the
edge directly in the control flow graph.

compiler/fir/semantics/src/org/jetbrains/kotlin/fir/resolve/dfa/LogicSystem.kt

@@ -21,7 +21,6 @@ abstract class LogicSystem<FLOW : Flow>(protected val context: ConeInferenceCont
     abstract fun addImplication(flow: FLOW, implication: Implication)
     abstract fun addLocalVariableAlias(flow: FLOW, alias: RealVariable, underlyingVariable: RealVariable)
     abstract fun recordNewAssignment(flow: FLOW, variable: RealVariable, index: Int)
-    abstract fun copyAllInformation(from: FLOW, to: FLOW)
     abstract fun isSameValueIn(a: FLOW, b: FLOW, variable: RealVariable): Boolean
 
     abstract fun translateVariableFromConditionInStatements(

compiler/fir/semantics/src/org/jetbrains/kotlin/fir/resolve/dfa/PersistentLogicSystem.kt

@@ -79,14 +79,6 @@ abstract class PersistentLogicSystem(context: ConeInferenceContext) : LogicSyste
     override fun forkFlow(flow: PersistentFlow): PersistentFlow =
         PersistentFlow(flow)
 
-    override fun copyAllInformation(from: PersistentFlow, to: PersistentFlow) {
-        to.approvedTypeStatements = from.approvedTypeStatements
-        to.logicStatements = from.logicStatements
-        to.directAliasMap = from.directAliasMap
-        to.backwardsAliasMap = from.backwardsAliasMap
-        to.assignmentIndex = from.assignmentIndex
-    }
-
     override fun joinFlow(flows: Collection<PersistentFlow>): PersistentFlow =
         foldFlow(flows, allExecute = false)
 

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

@@ -781,8 +781,6 @@ class EnterSafeCallNode(owner: ControlFlowGraph, override val fir: FirSafeCallEx
     }
 }
 class ExitSafeCallNode(owner: ControlFlowGraph, override val fir: FirSafeCallExpression, level: Int, id: Int) : CFGNode<FirSafeCallExpression>(owner, level, id) {
-    val lastNodeInNotNullCase: CFGNode<*>? get() = previousNodes.getOrNull(1)
-
     override fun <R, D> accept(visitor: ControlFlowGraphVisitor<R, D>, data: D): R {
         return visitor.visitExitSafeCallNode(this, data)
     }