Avoid adding HWrapReceiver during graph building.

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

Committed: http://code.google.com/p/v8/source/detail?r=15843

[Michael Starzinger, 2013-07-23 20:56:53]

Easy solution for one of my problems I mentioned today. :)

[titzer, 2013-07-24 07:25:46]

lgtm

[Michael Starzinger, 2013-07-24 08:05:55]

Committed patchset #1 manually as r15843 (presubmit successful).