Prevent cross-EP Cast fusion in RemoveDuplicateCastTransformer#27363
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Prevent cross-EP Cast fusion in RemoveDuplicateCastTransformer#27363
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Description
Fixes an incorrect Cast deduplication across execution provider boundaries.
Today,
Cast(int64->float, CPU) -> Cast(float->float16, WebGPU)can be fused intoCast(int64->float16, WebGPU), which is invalid for WebGPU and can fail kernel lookup.This change adds an EP check so Cast fusion only happens when both nodes are on the same EP, and adds a regression test for this scenario.
Motivation and Context
Fixes #27291