xcodeproj : add -O3 -DNDEBUG
in release mode
#640
Merged
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It does the same thing from the makefile of main.cpp to optimize ggml in release mode for demo better performance on iOS/macOS app.
Under the test of M1 Max MacBook Pro, the realtime transcribing on iOS simulator saves about ~200ms on average.
However, add the flags in an app project seems not ideal in real world (It applies all C/C++ files), so I've add some information in readme.