x86: move XOP emulation code back to x86inc

Only two functions that use xop multiply-accumulate instructions where the
first operand is the same as the fourth actually took advantage of the macros.

This further reduces differences with x264's x86inc.

Reviewed-by: Ronald S. Bultje <rsbultje@gmail.com>
Signed-off-by: James Almer <jamrial@gmail.com>

libswresample/x86/resample.asm

@@ -176,7 +176,12 @@ cglobal resample_common_%1, 1, 7, 2, ctx, phase_shift, dst, frac, \
 .inner_loop:
     movu                          m1, [srcq+min_filter_count_x4q*1]
 %ifidn %1, int16
-    PMADCSWD                      m0, m1, [filterq+min_filter_count_x4q*1], m0, m1
+%if cpuflag(xop)
+    vpmadcswd                     m0, m1, [filterq+min_filter_count_x4q*1], m0
+%else
+    pmaddwd                       m1, [filterq+min_filter_count_x4q*1]
+    paddd                         m0, m1
+%endif
 %else ; float/double
 %if cpuflag(fma4) || cpuflag(fma3)
     fmaddp%4                      m0, m1, [filterq+min_filter_count_x4q*1], m0