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Currently, we're adding a uint64_t describing the current subtarget so that matching can check whether the specified register is valid. However, we want to move to a bitset for those bits (x86 has more than 64 of them). This can't live in a union so it's probably better to do the checks early (especially as there are only 3 of them). git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@226841 91177308-0d34-0410-b5e6-96231b3b80d8