dfa10ec2e6
The arm_sme.zero op currently only supports 8-bit element tiles. This extends the op and lowering from 'arith.constant dense<0>' -> 'arm_sme.zero' to support all tile types. The lowering from arm_sme.zero to intrinsics is not updated as part of this patch and will be done separately. Reviewed By: dcaballe Differential Revision: https://reviews.llvm.org/D156980