whisper : add precalculated values of sin/cos for speeding up FFT (#1142)
* Add sin/cos precalculated values to speedup FFT
* Update whisper.cpp
Co-authored-by: bobqianic <129547291+bobqianic@users.noreply.github.com>
* Update whisper.cpp
Co-authored-by: bobqianic <129547291+bobqianic@users.noreply.github.com>
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Co-authored-by: Georgi Gerganov <ggerganov@gmail.com>
Co-authored-by: bobqianic <129547291+bobqianic@users.noreply.github.com>