Avoid calling std::time::Instant::now on wasm32-unknown-unknown
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This function was called at the start of every graph run, even when timing was disabled. Replace it with a fallback which does nothing on wasm32. In future this can be modified to use `performance.now()`.
This makes it possible to get the stack trace if model loading crashes inside the rten wasm binary.
Downstream applications targeting wasm32 will need to use `Model::load_file` instead.
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std::time::Instant::nowpanics on wasm32-unknown-unknown. Replace calls with a wrapper which is currently a no-op, but can be modified to useperformance.now()in future.Model::load_mmaptestSee robertknight/ocrs#93.