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Splits cwrsi() inner loop in two to avoid the min/max and some load chains

--- a/celt/cwrs.c

+++ b/celt/cwrs.c

@@ -473,7 +473,13 @@

     _i-=p&s;

     /*Count how many pulses were placed in this dimension.*/

     k0=_k;

-    for(p=CELT_PVQ_U(_n,_k);p>_i;p=CELT_PVQ_U(_n,_k))_k--;

+    p=CELT_PVQ_U(_n,_k);

+    if(_k>_n){

+      const opus_uint32 *row;

+      row=CELT_PVQ_U_ROW[_n];

+      for(;p>_i&&_k>_n;p=row[_k])_k--;

+    }

+    for(;p>_i;p=CELT_PVQ_U_ROW[_k][_n])_k--;

     _i-=p;

     *_y++=(k0-_k+s)^s;

   }