[json] Repair JSON.parse regression with non-sequential strings.
Make sure to flatten strings first in JSON.parse() builtins, otherwise we always hit the slow path for non-sequential strings, i.e. for cons strings. Also don't create any arguments adaptor frames for JSON.parse() as the C++ builtin can handle any number of inputs properly. R=yangguo@chromium.org Review-Url: https://codereview.chromium.org/2039553002 Cr-Commit-Position: refs/heads/master@{#36722}
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