[RISCV] Add stub backend

This contains just enough for lib/Target/RISCV to compile. Notably a basic 
RISCVTargetMachine and RISCVTargetInfo. At this point you can attempt llc 
-march=riscv32 myinput.ll and will find it fails due to the lack of 
MCAsmInfo.

See http://lists.llvm.org/pipermail/llvm-dev/2016-August/103748.html for 
further discussion

Differential Revision: https://reviews.llvm.org/D23560


git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@285712 91177308-0d34-0410-b5e6-96231b3b80d8
11 files changed