Add AVX2 version of ConvolveVertically

src/opts/SkOpts_hsw.cpp

Index: src/opts/SkOpts_hsw.cpp
diff --git a/src/opts/SkOpts_hsw.cpp b/src/opts/SkOpts_hsw.cpp
index 8c31af5b8373d60d6dd5a772d24e44c26acdac34..f7af52ef40f68c3217ebca34d634018fce855026 100644
--- a/src/opts/SkOpts_hsw.cpp
+++ b/src/opts/SkOpts_hsw.cpp
@@ -8,11 +8,13 @@
 #include "SkOpts.h"
 
 #define SK_OPTS_NS hsw
+#include "SkBitmapFilter_opts.h"
 #include "SkRasterPipeline_opts.h"
 
 namespace SkOpts {
     void Init_hsw() {
         compile_pipeline = hsw::compile_pipeline;
+        convolve_vertically = hsw::convolve_vertically;
     }
 }