Use Uint32 for `int` in IDL.

pkg/analyzer/tool/summary/idl.dart

 // Copyright (c) 2015, the Dart project authors.  Please see the AUTHORS file
 // for details. All rights reserved. Use of this source code is governed by a
 // BSD-style license that can be found in the LICENSE file.
 
 /**
  * This file is an "idl" style description of the summary format.  It is not
  * executed directly; instead it is parsed and transformed into code that
  * implements the summary format.
  *
  * The code generation process introduces the following non-typical semantics:
  * - Fields of type List are never null, and have a default value of the empty
  *   list.
- * - Fields of type int are never null, and have a default value of zero.
+ * - Fields of type int are unsigned 32-bit integers, never null, and have a
+ *   default value of zero.
  * - Fields of type String are never null, and have a default value of ''.
  * - Fields of type bool are never null, and have a default value of false.
  * - Fields whose type is an enum are never null, and have a default value of
  *   the first value declared in the enum.
  *
  * Terminology used in this document:
  * - "Unlinked" refers to information that can be determined from reading a
  *   single .dart file in isolation.
  * - "Prelinked" refers to information that can be determined from the defining
  *   compilation unit of a library, plus direct imports, plus the transitive
@@ skipping 267 matching lines @@
   List<UnlinkedUnit> unlinkedUnits;
 }
 
 /**
  * Summary information about a reference to a type.
  */
 class TypeRef {
   /**
    * If this [TypeRef] is contained within [LinkedUnit.types], slot id (which
    * is unique within the compilation unit) identifying the target of type
-   * propagation or type inference with which this [TypeRef] is asociated.
+   * propagation or type inference with which this [TypeRef] is associated.
    *
    * Otherwise zero.
    */
   int slot;
 
   /**
    * Index into [UnlinkedUnit.references] for the type being referred to, or
    * zero if this is a reference to a type parameter.
    *
    * Note that since zero is also a valid index into
@@ skipping 1104 matching lines @@
   /**
    * If this variable is propagable, nonzero slot id identifying which entry in
    * [LinkedLibrary.types] contains the propagated type for this variable.  If
    * there is no matching entry in [LinkedLibrary.types], then this variable's
    * propagated type is the same as its declared type.
    *
    * Non-propagable variables have a [propagatedTypeSlot] of zero.
    */
   int propagatedTypeSlot;
 }