Revert r9612, it hits an assertion under special circumstances.

Revert r9612, it hits an assertion under special circumstances.

Problematic code is e.g.:

   function typeofViaVariable() {
     var foo = typeof({})
     return foo === "undefined";
   }
Committed: http://code.google.com/p/v8/source/detail?r=9640

[Sven Panne, 2011-10-14 15:01:53]

TBR

[Vyacheslav Egorov (Chromium), 2011-10-14 15:02:02]

lgtm