Don't swallow exception in KotlinBuiltIns, assert instead

See 16b6bcc

 #KT-9820 Open

core/descriptors/src/org/jetbrains/kotlin/builtins/KotlinBuiltIns.java

@@ -870,7 +870,9 @@ public abstract class KotlinBuiltIns {
         List<TypeProjection> arguments = type.getArguments();
         int first = isExtensionFunctionType(type) ? 1 : 0;
         int last = arguments.size() - 2;
-        List<TypeProjection> parameterTypes = new ArrayList<TypeProjection>(Math.max(0, last - first + 1));
+        // TODO: fix bugs associated with this here and in neighboring methods, see KT-9820
+        assert first <= last + 1 : "Not an exact function type: " + type;
+        List<TypeProjection> parameterTypes = new ArrayList<TypeProjection>(last - first + 1);
         for (int i = first; i <= last; i++) {
             parameterTypes.add(arguments.get(i));
         }