inside the same project is flaky with VisualStudio when building with
Incredibuild.
So I splitted the mksnapshot.exe generation, snapshot.cc generation and
snapshot.cc compilation in three different projects.

Review URL: http://codereview.chromium.org/18770


git-svn-id: http://v8.googlecode.com/svn/branches/bleeding_edge@1176 ce2b1a6d-e550-0410-aec6-3dcde31c8c00