Add SSSE3 Optimizations for premul and swap

src/opts/SkOpts_ssse3.cpp

Index: src/opts/SkOpts_ssse3.cpp
diff --git a/src/opts/SkOpts_ssse3.cpp b/src/opts/SkOpts_ssse3.cpp
index 675cdaa23e44bb832f99a7ef967cefb5c6356640..5378377d1e99d8e1982dab472b075f189941fc45 100644
--- a/src/opts/SkOpts_ssse3.cpp
+++ b/src/opts/SkOpts_ssse3.cpp
@@ -9,6 +9,7 @@
 #define SK_OPTS_NS sk_ssse3
 #include "SkBlitMask_opts.h"
 #include "SkColorCubeFilter_opts.h"
+#include "SkSwizzler_opts.h"
 #include "SkXfermode_opts.h"
 
 namespace SkOpts {
@@ -16,5 +17,9 @@ namespace SkOpts {
         create_xfermode = sk_ssse3::create_xfermode;
         blit_mask_d32_a8 = sk_ssse3::blit_mask_d32_a8;
         color_cube_filter_span = sk_ssse3::color_cube_filter_span;
+
+        premul_xxxa = sk_ssse3::premul_xxxa;
+        premul_swaprb_xxxa = sk_ssse3::premul_swaprb_xxxa;
+        swaprb_xxxa = sk_ssse3::swaprb_xxxa;
     }
 }