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f52baf72c1
Register units are already used internally in TableGen to compute register pressure sets and overlapping registers. This patch makes them available to the code generators. The register unit lists are differentially encoded so they can be reused for many related registers. This keeps the total size of the lists below 200 bytes for most targets. ARM has the largest table at 560 bytes. Add an MCRegUnitIterator for traversing the register unit lists. It provides an abstract interface so the representation can be changed in the future without changing all clients. git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@157650 91177308-0d34-0410-b5e6-96231b3b80d8
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