Double-align Zone allocations to fix MIPS issue.

runtime/vm/zone.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/zone.h"
 
 #include "platform/assert.h"
 #include "platform/utils.h"
 #include "vm/flags.h"
 #include "vm/handles_impl.h"
@@ skipping 45 matching lines @@
 #endif
     Segment::Delete(current);
     current = next;
   }
 }
 
 
 Zone::Segment* Zone::Segment::New(intptr_t size, Zone::Segment* next) {
   ASSERT(size >= 0);
   Segment* result = reinterpret_cast<Segment*>(new uint8_t[size]);
+  ASSERT(Utils::IsAligned(result->start(), Zone::kAlignment));
   if (result != NULL) {
 #ifdef DEBUG
     // Zap the entire allocated segment (including the header).
     memset(result, kZapUninitializedByte, size);
 #endif
     result->next_ = next;
     result->size_ = size;
   }
   return result;
 }
@@ skipping 133 matching lines @@
   va_list args2;
   va_start(args2, format);
   OS::VSNPrint(buffer, (len + 1), format, args2);
   va_end(args2);
 
   return buffer;
 }
 
 
 }  // namespace dart