This CL has two goals: (i) avoid casting and scaling of the NN weights for every processed feature vector and (ii) prepare for SIMD optimizations. Bug: webrtc:10480 Change-Id: Ice7bac5657123354714cc7c63b00abbb8a76c7d7 Reviewed-on: https://webrtc-review.googlesource.com/c/src/+/141413 Commit-Queue: Alessio Bazzica <alessiob@webrtc.org> Reviewed-by: Fredrik Hernqvist <fhernqvist@webrtc.org> Cr-Commit-Position: refs/heads/master@{#29675}