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.kt

@@ -71,7 +71,7 @@ fun test7(x: String?) {
         foo(
             id(run { p = null; n() }),
             1,
-            run { p.length; 123 } // Bad (p = null)
+            run { <!SMARTCAST_IMPOSSIBLE!>p<!>.length; 123 } // Bad (p = null)
         )
         p<!UNSAFE_CALL!>.<!>length // Bad (p = null)
     }