[AArch64][machine-scheduler][Neoverse-N2] fdiv is blocking (#119206) For Neoverse-N2, mark FP divide and square root instructions as blocking their pipeline until complete. This matches the way that blocking integer divide instructions are marked. From the Software Optimization Guide, section 3.14 Notes: 1. FP divide and square root operations are performed using an iterative algorithm and block subsequent similar operations to the same pipeline until complete. --------- Co-authored-by: Cullen Rhodes <cullen.rhodes@arm.com>
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