Passing DataFlowInfo to local classes/objects

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

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

@@ -0,0 +1,16 @@
+// KT-338 Support autocasts in nested declarations
+
+fun f(a: Any?) {
+  if (a is B) {
+    class C : X(a) {
+      {
+        a.foo()
+      }
+    }
+  }
+}
+
+trait B {
+  fun foo() {}
+}
+open class X(b: B)

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

@@ -0,0 +1,9 @@
+fun foo(x: Any?) {
+    if (x is String) {
+        object : Base(x) {
+            fun bar() = x.length
+        }
+    }
+}
+
+open class Base(s: String)

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

@@ -0,0 +1,15 @@
+// KT-2225 Object expression delegation parameter should be checked with data flow info
+
+trait A {
+    fun foo() : Int
+}
+
+class B : A {
+    override fun foo() = 10
+}
+fun foo(b: B?) : Int {
+    if (b == null) return 0
+    val o = object : A by b { //no info about b not null check
+    }
+    return o.foo()
+}

compiler/testData/diagnostics/tests/dataFlow/local/kt2835.kt

@@ -0,0 +1,8 @@
+open class X(val s: String)
+
+fun f(a: String?) {
+    if (a != null) {
+        object : X(a) { // Type mismatch: inferred type is jet.String? but jet.String was expected
+        }
+    }
+}