Reviewers: Mads Ager,

Message:
This does not break the 64-bit Linux Chromium build.  It runs with more  
than 25
tabs, with 2GB of unshared virtual memory reserved for each.  The debug  
chromium
build with debuggers attached to each renderer cannot run more than about 5
tabs, and that gave a false indication that something was broken.

This now only reserves 256 MB of address space for code objects.


Description:
Recommit coderanges putting code objects within a 2 GB range, reserving  
only a
256 MB range of virtual memory for the code range.

Please review this at http://codereview.chromium.org/243087

SVN Base: http://v8.googlecode.com/svn/branches/bleeding_edge/

Affected files:
   M     src/heap.h
   M     src/heap.cc
   M     src/spaces.h
   M     src/spaces.cc
   M     test/cctest/test-alloc.cc



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