Fix NORM_ALIASING_HACK
We need to move the history out of the way before we write to the
shape array X, or else we get corruption of the audio.
Signed-off-by: 
Jean-Marc Valin <jmvalin@amazon.com>
We need to move the history out of the way before we write to the
shape array X, or else we get corruption of the audio.
Signed-off-by: Jean-Marc Valin <jmvalin@amazon.com>