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

compiler/testData/diagnostics/tests/dataFlowInfoTraversal/While.fir.kt

@@ -0,0 +1,22 @@
+fun bar(x: Int): Int = x + 1
+
+fun foo() {
+    val x: Int? = null
+    while (x == null) {
+        bar(x)
+    }
+    bar(x)
+    
+    val y: Int? = null
+    while (y != null) {
+        bar(y)
+    }
+    bar(y)
+    
+    val z: Int? = null
+    while (z == null) {
+        bar(z)
+        break
+    }
+    bar(z)
+}