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arm: looprestoration: Fix register shifting at the end of a vertical run

This uses the right registers, corresponding to the ones shifted
in the arm64 version.

--- a/src/arm/32/looprestoration.S

+++ b/src/arm/32/looprestoration.S

@@ -529,8 +529,8 @@

 8:      // At this point, all registers up to q14-15,q1 are loaded with

         // edge/padding (depending on how many rows are left).

         filter          0 // This branches to 9f when done

-        vmov            q13, q14

-        vmov            q14, q1

+        vmov            q14, q15

+        vmov            q15, q1

         b               8b

 9:      // End of one vertical slice.