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optimisation: merged the init loop of vq_quant().

--- a/libcelt/vq.c

+++ b/libcelt/vq.c

@@ -112,7 +112,8 @@

    ALLOC(iy, N, int);

    ALLOC(signx, N, int);

    N_1 = 512/N;

-   

+

+   sum = 0;

    for (j=0;j<N;j++)

    {

       if (X[j]>0)

@@ -119,11 +120,8 @@

          signx[j]=1;

       else

          signx[j]=-1;

-   }

-   

-   sum = 0;

-   for (j=0;j<N;j++)

-   {

+      iy[j] = 0;

+      y[j] = 0;

       sum = MAC16_16(sum, P[j],P[j]);

    }

    Rpp = ROUND16(sum, NORM_SHIFT);

@@ -130,10 +128,6 @@

    celt_assert2(Rpp<=NORM_SCALING, "Rpp should never have a norm greater than unity");

-   for (i=0;i<N;i++)

-      y[i] = 0;

-   for (i=0;i<N;i++)

-      iy[i] = 0;

    xy = yy = yp = 0;

    pulsesLeft = K;