Data flow values: initializers for local variables are now stored as "bound values" with inherited nullability #KT-6840 Fixed

compiler/testData/diagnostics/tests/smartCasts/safecalls/safeAccessReceiverNotNull.kt

@@ -5,8 +5,7 @@
 fun kt6840_1(s: String?) {
     val hash = s?.hashCode()
     if (hash != null) {
-        // To be supported
-        s<!UNSAFE_CALL!>.<!>length
+        <!DEBUG_INFO_SMARTCAST!>s<!>.length
     }
 }
 
@@ -41,12 +40,11 @@ fun kt4565_1(a: SomeClass?) {
     val data = a?.data
     if (data != null) {
         <!DEBUG_INFO_SMARTCAST!>data<!>.hashCode()
-        // To be supported
-        a<!UNSAFE_CALL!>.<!>hashCode()
-        a<!UNSAFE_CALL!>.<!>data.hashCode()
+        <!DEBUG_INFO_SMARTCAST!>a<!>.hashCode()
+        <!DEBUG_INFO_SMARTCAST!>a<!>.data.hashCode()
     }
     if (a?.data != null) {
-        // To be supported
+        // To be supported (?!)
         data<!UNSAFE_CALL!>.<!>hashCode()
         <!DEBUG_INFO_SMARTCAST!>a<!>.hashCode()
         <!DEBUG_INFO_SMARTCAST!>a<!>.data.hashCode()

compiler/testData/diagnostics/tests/smartCasts/varnotnull/boundInitializer.kt

@@ -0,0 +1,20 @@
+fun foo(arg: Int?) {
+    val x = arg
+    if (x != null) {
+        <!DEBUG_INFO_SMARTCAST!>arg<!>.hashCode()
+    }
+    val y: Any? = arg
+    if (y != null) {
+        <!DEBUG_INFO_SMARTCAST!>arg<!>.hashCode()
+    }
+    val yy: Any?
+    yy = arg
+    if (yy != null) {
+        arg<!UNSAFE_CALL!>.<!>hashCode()
+    }
+    var z = arg
+    z = z?.let { 42 }
+    if (z != null) {
+        arg<!UNSAFE_CALL!>.<!>hashCode()
+    }
+}

compiler/testData/diagnostics/tests/smartCasts/varnotnull/boundInitializer.txt

@@ -0,0 +1,3 @@
+package
+
+public fun foo(/*0*/ arg: kotlin.Int?): kotlin.Unit