Fixed two register allocator bugs (off-by-one error/failure propagation).

test/cctest/test-heap-profiler.cc

 // Copyright 2011 the V8 project authors. All rights reserved.
 // Redistribution and use in source and binary forms, with or without
 // modification, are permitted provided that the following conditions are
 // met:
 //
 //     * Redistributions of source code must retain the above copyright
 //       notice, this list of conditions and the following disclaimer.
 //     * Redistributions in binary form must reproduce the above
 //       copyright notice, this list of conditions and the following
 //       disclaimer in the documentation and/or other materials provided
@@ skipping 1713 matching lines @@
   CHECK_NE(NULL, own_descriptors);
   const v8::HeapGraphNode* own_transitions = GetProperty(
       map, v8::HeapGraphEdge::kInternal, "transitions");
   CHECK_EQ(NULL, own_transitions);
 }
 
 
 TEST(ManyLocalsInSharedContext) {
   v8::HandleScope scope;
   LocalContext env;
-  int num_objects = 5000;
+  int num_objects = 6000;
   CompileRun(
-      "var n = 5000;"
+      "var n = 6000;"
       "var result = [];"
       "result.push('(function outer() {');"
       "for (var i = 0; i < n; i++) {"
       "    var f = 'function f_' + i + '() { ';"
       "    if (i > 0)"
       "        f += 'f_' + (i - 1) + '();';"
       "    f += ' }';"
       "    result.push(f);"
       "}"
       "result.push('return f_' + (n - 1) + ';');"
@@ skipping 15 matching lines @@
   // Check all the objects have got their names.
   // ... well check just every 8th because otherwise it's too slow in debug.
   for (int i = 0; i < num_objects - 1; i += 8) {
     i::EmbeddedVector<char, 100> var_name;
     i::OS::SNPrintF(var_name, "f_%d", i);
     const v8::HeapGraphNode* f_object = GetProperty(
         context_object, v8::HeapGraphEdge::kContextVariable, var_name.start());
     CHECK_NE(NULL, f_object);
   }
 }