data flow info for arg may affect next argument's type for type argument inference case

compiler/testData/diagnostics/tests/smartCasts/inference/dependentOnPrevArg.kt

@@ -0,0 +1,7 @@
+package a
+
+fun <T> foo(u: T, <!UNUSED_PARAMETER!>v<!>: T): T = u
+
+fun test(s: String?) {
+    val <!UNUSED_VARIABLE!>r<!>: String = foo(s!!, s)
+}