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arm64: looprestoration: Avoid unnecessary alignment of the mid buffer

There's no gain in aligning it to more than 16 bytes. The ALIGN_STK_32
macro actually only aligns to 16 bytes on arm targets anyway.

--- a/src/arm/looprestoration_init_tmpl.c

+++ b/src/arm/looprestoration_init_tmpl.c

@@ -66,7 +66,7 @@

                                const int w, const int h, const int16_t fh[7],

                                const int16_t fv[7], const enum LrEdgeFlags edges)

 {

-    ALIGN_STK_32(int16_t, mid, 68 * 384,);

+    ALIGN_STK_16(int16_t, mid, 68 * 384,);

     int mid_stride = (w + 7) & ~7;

     // Horizontal filter