use DUP_ARRAY

Add a semantic patch for replace ALLOC_ARRAY+COPY_ARRAY with DUP_ARRAY
to reduce code duplication and apply its results.

Signed-off-by: René Scharfe <l.s.r@web.de>
Signed-off-by: Junio C Hamano <gitster@pobox.com>

contrib/coccinelle/array.cocci

@@ -94,3 +94,10 @@ expression n != 1;
 @@
 - ptr = xcalloc(n, \( sizeof(*ptr) \| sizeof(T) \) )
 + CALLOC_ARRAY(ptr, n)
+
+@@
+expression dst, src, n;
+@@
+-ALLOC_ARRAY(dst, n);
+-COPY_ARRAY(dst, src, n);
++DUP_ARRAY(dst, src, n);