[NI] Fix initial data flow info for analyzing lambdas

#KT-30734 Fixed

compiler/testData/diagnostics/tests/nullabilityAndSmartCasts/kt30734.kt

@@ -0,0 +1,16 @@
+// !DIAGNOSTICS: -UNUSED_VARIABLE
+// !WITH_NEW_INFERENCE
+// !LANGUAGE: +NewInference
+// Issue: KT-30734
+
+class Sample {
+    fun foo(): Boolean = true
+}
+
+fun test(ls: Sample?) {
+    val filter: () -> Boolean = if (ls == null) {
+        { false }
+    } else {
+        { <!DEBUG_INFO_SMARTCAST!>ls<!>.foo() } // OK in OI, error in NI
+    }
+}

compiler/testData/diagnostics/tests/nullabilityAndSmartCasts/kt30734.txt

@@ -0,0 +1,11 @@
+package
+
+public fun test(/*0*/ ls: Sample?): kotlin.Unit
+
+public final class Sample {
+    public constructor Sample()
+    public open override /*1*/ /*fake_override*/ fun equals(/*0*/ other: kotlin.Any?): kotlin.Boolean
+    public final fun foo(): kotlin.Boolean
+    public open override /*1*/ /*fake_override*/ fun hashCode(): kotlin.Int
+    public open override /*1*/ /*fake_override*/ fun toString(): kotlin.String
+}