Add a platform-independent max uword value.

runtime/vm/debugger.cc

 // Copyright (c) 2012, 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.
 
 #include "vm/debugger.h"
 
 #include "vm/code_generator.h"
 #include "vm/code_patcher.h"
 #include "vm/compiler.h"
 #include "vm/dart_entry.h"
@@ skipping 816 matching lines @@
   ASSERT(!func.HasOptimizedCode());
   Code& code = Code::Handle(func.unoptimized_code());
   ASSERT(!code.IsNull());
   PcDescriptors& desc = PcDescriptors::Handle(code.pc_descriptors());
   // We attempt to find the PC descriptor that is closest to the
   // beginning of the token range, in terms of native code address. If we
   // don't find a PC descriptor within the given range, we pick the
   // nearest one to the beginning of the range, in terms of token position.
   intptr_t best_fit_index = -1;
   intptr_t best_fit = INT_MAX;
-  uword lowest_pc = INT_MAX;
+  uword lowest_pc = kUwordMax;
   intptr_t lowest_pc_index = -1;
   for (int i = 0; i < desc.Length(); i++) {
     intptr_t desc_token_pos = desc.TokenIndex(i);
     if (desc_token_pos < first_token_pos) {
       continue;
     }
     PcDescriptors::Kind kind = desc.DescriptorKind(i);
     if ((kind == PcDescriptors::kIcCall) ||
         (kind == PcDescriptors::kFuncCall) ||
         (kind == PcDescriptors::kReturn)) {
@@ skipping 700 matching lines @@
 }
 
 
 void Debugger::RegisterCodeBreakpoint(CodeBreakpoint* bpt) {
   ASSERT(bpt->next() == NULL);
   bpt->set_next(code_breakpoints_);
   code_breakpoints_ = bpt;
 }
 
 }  // namespace dart