Harden %SetIsObserved with RUNTIME_ASSERTs
Now throws if its argument is already observed, or if the argument is the global proxy. BUG=371782 LOG=Y R=jkummerow@chromium.org Review URL: https://codereview.chromium.org/274163002 git-svn-id: https://v8.googlecode.com/svn/branches/bleeding_edge@21256 ce2b1a6d-e550-0410-aec6-3dcde31c8c00
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