onnxruntime

4dbb05f4 - [core] allow using initializer allocator for prepack (#26617)

[core] allow using initializer allocator for prepack (#26617) ### Description This PR makes ORT to prefer initializer allocator when calling `OpKernel::PrePack`. If an EP does not register an initializer allocator (currently only WebGPU does this), the behavior is kept unchanged. ### Motivation and Context Helps to improve the memory usage when doing prepack.