Matthias Braun 8e4eaabdb8 RegAllocGreedy: Allow target to specify register class ordering.
Specify an allocation order with a register class. This is used by register
allocators with a greedy heuristic. This is usefull as it is sometimes
beneficial to color more constrained classes first.

Differential Revision: http://reviews.llvm.org/D8626

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@233743 91177308-0d34-0410-b5e6-96231b3b80d8
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