FIR CFG: check lambda concurrency by data flow, not control flow

var p: String? = something
    if (p != null) {
      foo(
        run { p = null; n() },
        // This lambda executes strictly after the one above by CFG,
        // but data flow for type inference comes from before the call
        // so p would get smartcasted if not forbidden.
	run { p.length; 123 }
      )
    }

compiler/fir/analysis-tests/testData/resolve/cfg/flowFromInplaceLambda2.dot

@@ -870,7 +870,7 @@ digraph flowFromInplaceLambda2_kt {
                             color=blue
                             325 [label="Enter block"];
                             326 [label="Access variable R|<local>/p|"];
-                            327 [label="Access variable R|kotlin/String.length|"];
+                            327 [label="Access variable <Inapplicable(UNSTABLE_SMARTCAST): kotlin/String.length>#"];
                             328 [label="Const: Int(123)"];
                             329 [label="Exit block"];
                         }