TypeUtils.containsSpecialType() fixed to account for flexible types

compiler/testData/diagnostics/tests/platformTypes/samConstructor.txt

@@ -0,0 +1,3 @@
+package
+
+internal fun test(): kotlin.Unit

core/descriptors/src/org/jetbrains/jet/lang/types/TypeUtils.java

@@ -533,6 +533,11 @@ public class TypeUtils {
     ) {
         if (type == null) return false;
         if (isSpecialType.invoke(type)) return true;
+        Flexibility flexibility = type.getCapability(Flexibility.class);
+        if (flexibility != null
+                && (containsSpecialType(flexibility.getLowerBound(), isSpecialType) || containsSpecialType(flexibility.getUpperBound(), isSpecialType))) {
+            return true;
+        }
         for (TypeProjection projection : type.getArguments()) {
             if (containsSpecialType(projection.getType(), isSpecialType)) return true;
         }