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Optimize matrixTransp1Mul_fx.

Nicolas Roussinrequested to merge
2181-optimize-matrixtransp1mul_fx into main

Closes #2181

Complexity analysis

Tiny improvement from 138.376 WMOPS to 137.352 WMOPS: this bit-exact optimisation removes a lot of unnecessary shift operations.

Before:

 --- Complexity analysis [WMOPS] ---  

                                           |------  SELF  ------|   |---  CUMULATIVE  ---|
                        routine    calls     min     max     avg      min     max     avg 
                ---------------   ------   ------  ------  ------   ------  ------  ------
                ivas_jbm_dec_tc     1.00    1.891   1.915   1.915   26.345  38.997  29.507
               ivas_spar_decode     1.00    1.010   1.041   1.019    2.544   2.684   2.628
               ivas_spar_dec_MD     1.00    1.526   1.665   1.609    1.526   1.665   1.609
                   ivas_sce_dec     1.00    0.246   0.246   0.246   21.794  34.495  24.964
                  ivas_core_dec     1.00    3.152  11.390   7.909   21.548  34.249  24.718
                 acelp_core_dec     0.61   12.830  19.132  14.543   12.830  19.132  14.543
      ivas_dec_prepare_renderer     1.00    7.068   8.724   7.173    7.068   8.724   7.173
                ivas_dec_render     1.00   77.336  88.004  87.518   81.487  92.262  91.776
    ivas_sba_prototype_renderer     4.00    3.922   4.258   4.258    3.922   4.258   4.258
            stereo_tcx_core_dec     0.39   17.651  31.015  20.324   17.651  31.015  20.324
                ---------------   ------   ------  ------  ------
                          total  1000.00  119.955 138.376 128.456

After:

 --- Complexity analysis [WMOPS] ---  

                                           |------  SELF  ------|   |---  CUMULATIVE  ---|
                        routine    calls     min     max     avg      min     max     avg 
                ---------------   ------   ------  ------  ------   ------  ------  ------
                ivas_jbm_dec_tc     1.00    1.891   1.915   1.915   26.345  38.997  29.507
               ivas_spar_decode     1.00    1.010   1.041   1.019    2.544   2.684   2.628
               ivas_spar_dec_MD     1.00    1.526   1.665   1.609    1.526   1.665   1.609
                   ivas_sce_dec     1.00    0.246   0.246   0.246   21.794  34.495  24.964
                  ivas_core_dec     1.00    3.152  11.390   7.909   21.548  34.249  24.718
                 acelp_core_dec     0.61   12.830  19.132  14.543   12.830  19.132  14.543
      ivas_dec_prepare_renderer     1.00    7.068   8.724   7.173    7.068   8.724   7.173
                ivas_dec_render     1.00   76.312  86.980  86.494   80.463  91.238  90.752
    ivas_sba_prototype_renderer     4.00    3.922   4.258   4.258    3.922   4.258   4.258
            stereo_tcx_core_dec     0.39   17.651  31.015  20.324   17.651  31.015  20.324
                ---------------   ------   ------  ------  ------
                          total  1000.00  118.931 137.352 127.432
Edited by Nicolas Roussin

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