Jakob Stoklund Olesen 0c67e01e5f Add an AllocationOrder class that can iterate over the allocatable physical
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.

llvm-svn: 121497
2010-12-10 18:36:02 +00:00
2010-11-16 22:13:33 +00:00
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