[FIR-TEST] Add new testdata generated after changes in previous commit

compiler/testData/diagnostics/tests/smartCasts/variables/ifNullAssignment.fir.kt

@@ -0,0 +1,73 @@
+// !WITH_NEW_INFERENCE
+// See KT-13468, KT-13765
+
+fun basic(): String {
+    var current: String? = null
+    current = if (current == null) "bar" else current
+    return current
+}
+
+fun foo(flag: Boolean) {
+    var x: String? = null
+
+    if (x == null) {
+        x = if (flag) "34" else "12"
+    }
+
+    x.hashCode()
+}
+
+fun bar(flag: Boolean) {
+    var x: String? = null
+
+    if (x == null) {
+        x = when {
+            flag -> "34"
+            else -> "12"
+        }
+    }
+
+    x.hashCode()
+}
+
+fun baz(flag: Boolean) {
+    var x: String? = null
+
+    if (x == null) {
+        x = if (flag) {
+            "34"
+        } else {
+            "12"
+        }
+    }
+
+    x.hashCode()
+}
+
+fun gav(flag: Boolean, arg: String?) {
+    var x: String? = null
+
+    if (x == null) {
+        x = arg ?: if (flag) {
+            "34"
+        } else {
+            "12"
+        }
+    }
+
+    x.hashCode()
+}
+
+fun gau(flag: Boolean, arg: String?) {
+    var x: String? = null
+
+    if (x == null) {
+        x = if (flag) {
+            arg ?: "34"
+        } else {
+            arg ?: "12"
+        }
+    }
+
+    x.hashCode()
+}