[AVR] Add the machine code emitter

Reviewers: arsenm, kparzysz

Subscribers: wdng, beanz, japaric, llvm-commits, mgorny

Differential Revision: https://reviews.llvm.org/D25388

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@285269 91177308-0d34-0410-b5e6-96231b3b80d8
4 files changed