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Trying to prevent PVQ-level splits

We prevent as many as possible, but they can still occur if we
manage to reach the LN limit

--- a/libcelt/bands.c

+++ b/libcelt/bands.c

@@ -457,7 +457,7 @@

    split = stereo = Y != NULL;

-   if (b>(32<<BITRES) && !stereo && LM>0)

+   if (!stereo && LM>0 && !fits_in32(N, get_pulses(bits2pulses(m, m->bits[LM][i], N, b))))

    {

       N /= 2;

       Y = X+N;

@@ -667,7 +667,7 @@

    split = stereo = Y != NULL;

-   if (b>(32<<BITRES) && !stereo && LM>0)

+   if (!stereo && LM>0 && !fits_in32(N, get_pulses(bits2pulses(m, m->bits[LM][i], N, b))))

    {

       N /= 2;

       Y = X+N;