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a93090ccd9
This is still a topological ordering such that every register class gets a smaller enum value than its sub-classes. Placing the smaller spill sizes first makes a difference for the super-register class bit masks. When looking for a super-register class, we usually want the smallest possible kind of super-register. That is now available as the first bit set in the bit mask. git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@156222 91177308-0d34-0410-b5e6-96231b3b80d8
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