[COMMITTED] Split gimple-range into gimple-range-fold and gimple-range.

[Andrew MacLeod]

This file removes all the fold_using_range related code from 
gimple-range.{h,cc} and moves it into its own file, gimple-range-fold.{h,cc}

A couple of routines were also relocated to gimple-range-gori.{h,cc} as 
they were strictly related to unwind calculations and belong there.

This leaves gimple-range to contain mostly the ranger, and any derived 
versions.  This is purely a structural change, no other impact.  Cleaned 
up the include file list in gimple-range as well.

Bootstrap on x86_64-pc-linux-gnu with no regressions.  Pushed.

Andrew

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