> What's LTO?  I guess it's Link Time Optimization?  Is there any

Yes. Link Time Optimization with modern gcc.

> documentation about how it works or how to use it?

It's still a separate tree, but bits'n'pieces are slowly
making it into the kernel.

https://github.com/andikleen/linux-misc/tree/lto-3.12

https://github.com/andikleen/linux-misc/blob/5a18e33264321b01816a220ab14207a5f26ae16e/Documentation/lto-build

http://halobates.de/kernel-lto.pdf

-Andi
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