Hardening asserts for SILK float

silk/float/LPC_analysis_filter_FLP.c

silk/float/apply_sine_window_FLP.c

silk/float/encode_frame_FLP.c

silk/float/find_LPC_FLP.c

silk/float/find_pitch_lags_FLP.c

silk/float/find_pred_coefs_FLP.c

silk/float/pitch_analysis_core_FLP.c

silk/float/residual_energy_FLP.c

silk/float/schur_FLP.c

silk/float/sort_FLP.c

silk/float/warped_autocorrelation_FLP.c