This is a new static flag system, designed to have all flags in a central place, and compiled into the binary without requiring static constructors for registration.  All flags are moved out of the specific modules and into flags.defs, with different sections for debug, release, etc.  The flag variables are always defined.  For example, a debug flag in release mode still exists, but is read only and set to the default value.

git-svn-id: http://v8.googlecode.com/svn/branches/bleeding_edge@296 ce2b1a6d-e550-0410-aec6-3dcde31c8c00