New LTO branch ready

[Daniel Berlin]

Hi guys, I have merged all patches touching lto/ into the new lto branch

I'm almost 100% positive the result will not compile.  There are no
interesting conflicts to report (most were just formatting changes).
I have not merged ChangeLog.lto onto the new branch, since it looked
like it only contained info about changes that were outside of lto/,
and the changes to lto/ went into lto/ChangeLog

If you want it, i'm happy to copy it.

I will perform  merges from mainline to branch every week or two,
unless you guys see a good reason not to