[opus] [Profiling][FFT][AArch64] FFT Profiling data on AArch64

[Phil Wang]

Hi everyone,

I have profiled Opus on AArch64. I just run opus_demo with some pcm files.
Following is time proportion of FFT with different bitrate.

Bitrate  | Time cost by FFT/iFFT
24kb/s  | 15%
48kb/s  | 15%
96kb/s  | 13%

Any comment? I want some data close to real application, any suggestion?

Thanks,
Phil Wang
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