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fb9c043569
This adds an isel pattern and special XOR8rr_NOREX instruction to enable the use of h-registers for __builtin_parity. This avoids a copy and a shift instruction. The NOREX instruction is in case register allocation doesn't use the matching l-register for some reason. If a R8-R15 register gets picked instead, we won't be able to encode the instruction since an h-register can't be used with a REX prefix. Fixes PR46954
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