add FP8RowwiseQuantizedToFloat meta #1890
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Summary:
needed by PT2 adoption in IG-CTR FIRST where dynamo graph breaks happened at unsupported op fbgemm.FP8RowwiseQuantizedToFloat.default
https://www.internalfb.com/manifold/explorer/pyper_traces/tree/torchinductor_traces/f460142279-TrainingApplication/3953
add meta function according to
https://www.internalfb.com/code/fbsource/[6a410f90e6be]/fbcode/deeplearning/fbgemm/fbgemm_gpu/src/quantize_ops/quantize_fp8_rowwise.cu?lines=336-340
Differential Revision: D47741164