Define high level winograd operators and convert conv_2d_nhwc_fhwc into
winograd operators. According to Winograd Conv2D algorithm, we need
three transform operators for input, filter, and output transformation.
The formula of Winograd Conv2D algorithm is
Y = A^T x [(G x g x G^T) @ (B^T x d x B)] x A
filter transform: G x g x G^T
input transform: B^T x d x B
output transform: A^T x y x A
The implementation is based on the paper, Fast Algorithm for
Convolutional Neural Networks. (https://arxiv.org/abs/1509.09308)
Reviewers: stellaraccident, ftynse, Max191, GeorgeARM, cxy-1993, nicolasvasilache, MaheshRavishankar, dcaballe, rengolin
Reviewed By: ftynse, Max191, stellaraccident
Pull Request: https://github.com/llvm/llvm-project/pull/96181
7d246e84a4