Optimize color xforms with 2.2 gammas for SSE2

src/core/SkOpts.cpp

Index: src/core/SkOpts.cpp
diff --git a/src/core/SkOpts.cpp b/src/core/SkOpts.cpp
index 6d3e6c9feac4073b68b47d4dd8ac1c475fbb7b81..8dec3fad0f59103f83b6e9e956df2ae9f358b13b 100644
--- a/src/core/SkOpts.cpp
+++ b/src/core/SkOpts.cpp
@@ -16,6 +16,7 @@
 #include "SkBlitRow_opts.h"
 #include "SkBlurImageFilter_opts.h"
 #include "SkColorCubeFilter_opts.h"
+#include "SkColorXform_opts.h"
 #include "SkMorphologyImageFilter_opts.h"
 #include "SkSwizzler_opts.h"
 #include "SkTextureCompressor_opts.h"
@@ -76,6 +77,9 @@ namespace SkOpts {
 
     decltype(srcover_srgb_srgb) srcover_srgb_srgb = sk_default::srcover_srgb_srgb;
 
+    decltype(color_xform_2Dot2_RGBA_to_8888) color_xform_2Dot2_RGBA_to_8888 =
+            sk_default::color_xform_2Dot2_RGBA_to_8888;
+
     // Each Init_foo() is defined in src/opts/SkOpts_foo.cpp.
     void Init_ssse3();
     void Init_sse41();