Avoid adding HWrapReceiver during graph building.
This adds an early check to the graph builder which prevents adding an HWrapReceiver instruction if the receiver type is already known at graph building time. Also HAllocate no longer unnecessarily postpones setting it's type until type inference but sets it right away. These changes are in preparation for escape analysis. R=titzer@chromium.org Review URL: https://codereview.chromium.org/19493005 git-svn-id: http://v8.googlecode.com/svn/branches/bleeding_edge@15843 ce2b1a6d-e550-0410-aec6-3dcde31c8c00
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