[DAG] Handle truncated splat in isBoolConstant (#145473) This allows truncated splat / buildvector in isBoolConstant, to allow certain not instructions to be recognized post-legalization, and allow vselect to optimize. An override for x86 avx512 predicated vectors is required to avoid an infinite recursion from the code that detects zero vectors. From: ``` // Check if the first operand is all zeros and Cond type is vXi1. // If this an avx512 target we can improve the use of zero masking by // swapping the operands and inverting the condition. ```
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