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Defining merge_stereo() when S==-M or S==M

--- a/libcelt/bands.c

+++ b/libcelt/bands.c

@@ -346,10 +346,12 @@

    mid2 = SHR32(mid, 1);

    El = MULT16_16(mid2, mid2) + side - 2*xp;

    Er = MULT16_16(mid2, mid2) + side + 2*xp;

-   if (Er < EPSILON)

-      Er = EPSILON;

-   if (El < EPSILON)

-      El = EPSILON;

+   if (Er < QCONST32(6e-4f, 28) || El < QCONST32(6e-4f, 28))

+   {

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

+         Y[j] = X[j];

+      return;

+   }

 #ifdef FIXED_POINT

    kl = celt_ilog2(El)>>1;