[llvm] [TableGen][SchedMachineModel] Improve way to create WriteLatencyTable. (PR #86654)

[via llvm-commits]

lcvon007 wrote:

In TargetSchedModel::computeOperandLatency will use the WriteResourceID in LatencyTable, and it doesn't affect the logic when calling STI->getReadAdvanceCycles(UseDesc, UseIdx, WriteID) after change.

https://github.com/llvm/llvm-project/pull/86654