Add xorInput and xorOutput flags to adv-simd classes

Analysis tools are generating findings when the pointer xorBlocks is used as the flag. The other missing piece is, xorBlocks is never NULL when either BT_XorInput or BT_XorOuput. But we don't know how to train the analyzers with the information, so we make it explicit with the boolean flags xorInput and xorOutput.
Switching to the explicit flags costs us about 0.01 cpb on a modern Intel Core processor. In the typical case 0.01 is negligible.

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