[PATCH] D52010: RegAllocFast: Rewrite and improve

[Matthias Braun via Phabricator via llvm-commits]

MatzeB added reviewers: atanasyan, smaksimovic, petarj.
MatzeB added a comment.

@mips target owners: Please take a look at the unittests where I had to use `-rafast-ignore-missing-defs` to workaround invalid machine code. Those tests use a virtual register before it is defined (the old regalloc fast used to just ignore this in some cases).


Repository:
  rL LLVM

https://reviews.llvm.org/D52010