Changed optimization from /Ox to the (more) commonly used /O2 (which includes...

Changed optimization from /Ox to the (more) commonly used /O2 (which includes
/GF) in both SCons and Visual Studio build. There is not mesurable difference
neither in speed nor in code size.

Added whole program optimization to the SCons release build. This clutters the
linking of the samples a little with the option /LTCG. This option is not
strictly needed for linking, but if it is not specified the linker complaints
as it can see object files compiled with /GL and then restarts itself with
/LTCG which dosen't look very pretty.

Committed: http://code.google.com/p/v8/source/detail?r=407