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Makes silk_inner_prod_aligned() use celt_inner_prod() in fixed-point.

Should make it easier when writing assembly.

--- a/silk/fixed/vector_ops_FIX.c

+++ b/silk/fixed/vector_ops_FIX.c

@@ -30,6 +30,7 @@

 #endif

 #include "SigProc_FIX.h"

+#include "pitch.h"

 /* Copy and multiply a vector by a constant */

 void silk_scale_copy_vector16(

@@ -73,6 +74,9 @@

     const opus_int              len                 /*    I vector lengths                                              */

 )

 {

+#ifdef FIXED_POINT

+   return celt_inner_prod(inVec1, inVec2, len);

+#else

     opus_int   i;

     opus_int32 sum = 0;

     for( i = 0; i < len; i++ ) {

@@ -79,6 +83,7 @@

         sum = silk_SMLABB( sum, inVec1[ i ], inVec2[ i ] );

     }

     return sum;

+#endif

 }

 opus_int64 silk_inner_prod16_aligned_64(