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

compiler/testData/diagnostics/tests/smartCasts/doubleLambdaArgument.fir.kt

@@ -0,0 +1,10 @@
+interface Foo
+fun foo(): Foo? = null
+
+val foo: Foo = run {
+    run {
+        val x = foo()
+        if (x == null) throw Exception()
+        x
+    }
+}