Missing constant propagation: Literal -> Multibroadcast -> Quantizelinear

[CharlieL7]

• Found during Inference Model Review meeting
• Seen in bert_base_cased and distilgpt2_fp16 run with our --fp8 flag and probably also --int8

@12 = hip::hip_copy_literal[id=main:@literal:17] -> half_type, {768, 2304}, {2304, 1}
@13 = load[offset=188743680,end=190513152](@1) -> fp8e4m3fnuz_type, {64, 768, 2304}, {0, 2304, 1}
@14 = multibroadcast[out_lens={64, 768, 2304},out_dyn_dims={}](@12) -> half_type, {64, 768, 2304}, {0, 2304, 1}
@15 = gpu::code_object[code_object=5088,symbol_name=quantizelinear_kernel,global=113246208,local=1024,](@14,@13) -> fp8e4m3fnuz_type, {64, 768, 2304}, {0, 2304, 1}

• Example from distilgpt2_fp16
  • driver command: bin/driver perf /codes/distilgpt2_1_fp16_gpu.onnx --fp8 --fill1 input_ids --input-dim @input_ids 64 384 --batch 64
• The input to instruction @15 quantizelinear is a broadcasted literal. The broadcast instruction should have been swapped by the find_inner_broadcasts matcher in the simplify_algebra compiler pass to then allow the propagate_constant pass to make it into a constant.