[FIR] Support PreliminaryLoopVisitor in FIR DFA

compiler/testData/codegen/box/regressions/kt41806.kt

@@ -1,6 +1,5 @@
 // TARGET_BACKEND: JVM
 // WITH_RUNTIME
-// IGNORE_BACKEND_FIR: JVM_IR
 
 open class A {
     fun Foo() {
@@ -23,4 +22,4 @@ fun box(): String {
     test.Foo()
 
     return "OK"
-}
+}

compiler/testData/codegen/box/smartCasts/kt44804.kt

@@ -0,0 +1,43 @@
+// ISSUE: KT-44804
+// WITH_STDLIB
+
+abstract class AbstractInsnNode(val next: AbstractInsnNode? = null)
+
+class LineNumberNode(next: AbstractInsnNode? = null) : AbstractInsnNode(next) {
+    val line: Int = 1
+}
+
+class LabelNode() : AbstractInsnNode(null)
+
+fun isDeadLineNumber(insn: LineNumberNode, index: Int, frames: Array<out Any?>): Boolean {
+    // Line number node is "dead" if the corresponding line number interval
+    // contains at least one "dead" meaningful instruction and no "live" meaningful instructions.
+    var finger: AbstractInsnNode = insn
+    var fingerIndex = index
+    var hasDeadInsn = false
+    loop@ while (true) {
+        finger = finger.next ?: break
+        fingerIndex++
+        when (finger) {
+            is LabelNode ->
+                continue@loop
+            is LineNumberNode ->
+                if (finger.line != insn.line) return hasDeadInsn
+            else -> {
+                if (frames[fingerIndex] != null) return false
+                hasDeadInsn = true
+            }
+        }
+    }
+    return true
+}
+
+fun box(): String {
+    val node = LineNumberNode(
+        LineNumberNode(
+            LabelNode()
+        )
+    )
+    val result = isDeadLineNumber(node, 0, arrayOf(null, null, "aaa", "bbb"))
+    return if (result) "OK" else "fail"
+}