[Upstream]

Posted a patch set aimed at register allocation vs function calls. It does reduce code size by a percent or two. Emilio did some benchmarking and found that it does help a bit, but does not completely eliminate the effect of the call+ret overhead on the most modern of x86 implementations.

Reviewed v2 of tcg/riscv. Still a lot of work to be done, I think.

Cleanup of all tcg backends vs re-translation, which is no longer a thing.

Cleanup of tcg/i386 vs scratch registers.

[Other]

Updated the mustang to ubuntu 18.10. I was seeing some weirdness that I'm hoping I can blame on the bionic 4.15 kernel and will be gone with the cosmic 4.18 kernel. Fingers crossed...

r~