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When making PR #9957, I checked whether the ~0x1f masking in dcbx actually was necessary. I came to the conclusion that it wasn't, so I removed it. However, I hadn't checked the second half of InvalidateICache closely enough – the masking is actually needed.
This commit re-adds the masking, but this time in C++ code instead of in jitted code in order to save icache. Though I suppose the difference doesn't matter all that much, since this is in farcode and all...
Hopefully fixes https://bugs.dolphin-emu.org/issues/12612 (not tested).