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[RISCV] Add stub backend

Description

[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

Details

Committed
asbNov 1 2016, 10:27 AM
Differential Revision
D23560: [RISCV 3/10] Add stub backend
Parents
rL285711: AMDGPU: Fix buildbots broken by r285704
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