Passing DataFlowInfo when analyzing property initializers

#KT-2835 In Progress
#KT-2225 In Progress
#KT-338 In Progress

compiler/testData/diagnostics/tests/dataFlow/local/PropertyInLocalClass.kt

@@ -0,0 +1,9 @@
+fun test(x: Any?) {
+  if (x !is String) return
+  class C {
+    val v = x.length
+  }
+  object {
+    val v = x.length
+  }
+}