Improved performance of garbage collection by moving the function that updates pointe...

Improved performance of garbage collection by moving the function that updates pointers during compacting collection into the updating visitor.  This gives the compiler a better chance to inline and avoid a function call per (potential) pointer.

Extended the shell sample with a --runtime-flags option.

Added Visual Studio project files for the shell.cc and process.cc samples.

git-svn-id: http://v8.googlecode.com/svn/trunk@14 ce2b1a6d-e550-0410-aec6-3dcde31c8c00