Updated test data and stdlib sources.

compiler/testData/diagnostics/tests/controlFlowAnalysis/kt1219.1301.kt

@@ -2,7 +2,8 @@
 
 package kt1219
 
-fun <T, R> Iterable<T>.fold(var r: R, op: (T, R) -> R) : R {
+fun <T, R> Iterable<T>.fold(a: R, op: (T, R) -> R) : R {
+    var r = a
     this.foreach { r = op(it, r) } //unused value here
     return r
 }

compiler/testData/diagnostics/tests/controlFlowAnalysis/kt609.kt

@@ -2,8 +2,9 @@
 
 package kt609
 
-fun test(var a: Int) {
-    a = <!UNUSED_VALUE!>324<!> //should be an 'unused value' warning here
+fun test(a: Int) {
+    var <!ASSIGNED_BUT_NEVER_ACCESSED_VARIABLE!>aa<!> = a
+    aa = <!UNUSED_VALUE!>324<!> //should be an 'unused value' warning here
 }
 
 class C() {
@@ -16,4 +17,4 @@ open class A() {
 
 class B() : A() {
     final override fun foo(s : String) {}  //should not be a warning
-}
+}