Improve frame_sync_impl::get_symbol_val() performance #93
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On Apple M3 hyperfine shows 22% of improvement:
On RPi4 the improvement is about 13% (8.12s to 7.09s). Some details on the benchmarking setup are in #92.
There are other places in the code where a state returned by kiss_fft_alloc() is not reused, but it seems that they are not on the hot path.