Jakob Stoklund Olesen ee0d5d4398 Properly constrain register classes for sub-registers.
Not all GR64 registers have sub_8bit sub-registers.

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@157150 91177308-0d34-0410-b5e6-96231b3b80d8
2012-05-20 06:38:37 +00:00
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