Turning off Microsoft Visual C++ link-time code generation makes linking on Windows significantly which is convenient during development. There has also been a request from embedders for a way to control this for embedding application which does not use link-time code generation.

The name of the option is msvcltcg and the default value is 'on' to keep the same behaviour as before.
Review URL: http://codereview.chromium.org/69026

git-svn-id: http://v8.googlecode.com/svn/branches/bleeding_edge@1742 ce2b1a6d-e550-0410-aec6-3dcde31c8c00