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optimisation: Making use of restrict in find_spectral_pitch() to disambiguate
X and Y.

--- a/libcelt/pitch.c

+++ b/libcelt/pitch.c

@@ -102,15 +102,17 @@

 void find_spectral_pitch(kiss_fftr_cfg fft, const struct PsyDecay *decay, const celt_sig_t * restrict x, const celt_sig_t * restrict y, const celt_word16_t * restrict window, int overlap, int lag, int len, int C, int *pitch)

 {

    int c, i;

-   VARDECL(celt_word16_t, X);

-   VARDECL(celt_word16_t, Y);

+   VARDECL(celt_word16_t, _X);

+   VARDECL(celt_word16_t, _Y);

    VARDECL(celt_mask_t, curve);

+   celt_word16_t * restrict X, * restrict Y;

    int n2;

    int L2;

    SAVE_STACK;

    n2 = lag>>1;

    L2 = len>>1;

-   ALLOC(X, lag, celt_word16_t);

+   ALLOC(_X, lag, celt_word16_t);

+   X = _X;

    ALLOC(curve, n2, celt_mask_t);

    for (i=0;i<lag;i++)

@@ -141,7 +143,8 @@

    compute_masking(decay, X, curve, lag);

    /* Deferred allocation to reduce peak stack usage */

-   ALLOC(Y, lag, celt_word16_t);

+   ALLOC(_Y, lag, celt_word16_t);

+   Y = _Y;

    for (i=0;i<lag;i++)

       Y[i] = 0;

    /* Sum all channels of the past audio and copy into Y in bit-reverse order */