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The ia32 and x64 disassemblers call FindOldObject when trying to interpret addresses in the code. It's not safe to walk a heap page while it's being swept. BUG=dart:22087 R=iposva@google.com Review URL: https://codereview.chromium.org//915093005 git-svn-id: https://dart.googlecode.com/svn/branches/bleeding_edge/dart@43729 260f80e4-7a28-3924-810f-c04153c831b5