ANN: InplaceRealFFT.jl : inplace real-to-complex and complex-to-real FFT

[yuyichao]

@foobar_lv2

If a user decides to keep the real view and let the PaddedArray die

Compiler can do this, easily.

@foobar_lv2

in what kind of cases?

In general, just don’t do this kind of analysis. All what you can ever do is to assume certain compiler limitation and rely on implementation details that can easily change.