[cherry-pick2.9]add fuse flatten_contiguous_range and fc pass#6057

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daming5432 merged 1 commit intoPaddlePaddle:release/v2.9from daming5432:fuse_flatten_fc_2.9

May 12, 2021

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Commits on May 11, 2021

[pass][OpenCL]add fuse flatten_contiguous_range and fc pass (PaddlePaddle#6040 )
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