Fix UBSan invalid-shift-exponent in bf16 packa kernel#17
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dlp_packa_mr16_bf16bf16f32of32_row_major shifted a 32-bit unsigned by 32 when KC is a multiple of 32 (k_left == 0), which is UB. The mask is only consumed under if (k_left > 0) guards, so guard the shift to produce 0 in that case.
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dlp_packa_mr16_bf16bf16f32of32_row_majorshifted a 32-bit unsigned by 32 when KC is a multiple of 32 (k_left == 0), which is UB. The mask is only consumed under if (k_left > 0) guards, so guard the shift to produce 0 in that case.