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* Add an AllocationOrder class that can iterate over the allocatable physicalJakob Stoklund Olesen2010-12-101-0/+54
registers for a given virtual register. Reserved registers are filtered from the allocation order, and any valid hint is returned as the first suggestion. For target dependent hints, a number of arcane target hooks are invoked. git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@121497 91177308-0d34-0410-b5e6-96231b3b80d8