Matt Arsenault e31b74e98b Add AMDGPU related triple vendors/OSes
As support expands to more runtimes, we'll need to
distinguish between more than just HSA and unknown.
This also lets us stop using unknown everywhere.

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@260790 91177308-0d34-0410-b5e6-96231b3b80d8
2016-02-13 01:56:21 +00:00
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