SSE optimizations for GrayAlpha -> RGBA/BGRA Premul/Unpremul

bench/SwizzleBench.cpp

Index: bench/SwizzleBench.cpp
diff --git a/bench/SwizzleBench.cpp b/bench/SwizzleBench.cpp
index 0f85b59481669ad667ffdaa0ad466fa2201d2bbc..cf7a407f0e136b68e0a05c44276ca0eb14060a14 100644
--- a/bench/SwizzleBench.cpp
+++ b/bench/SwizzleBench.cpp
@@ -33,3 +33,5 @@ DEF_BENCH(return new SwizzleBench("SkOpts::RGBA_to_BGRA", SkOpts::RGBA_to_BGRA))
 DEF_BENCH(return new SwizzleBench("SkOpts::RGB_to_RGB1",  SkOpts::RGB_to_RGB1));
 DEF_BENCH(return new SwizzleBench("SkOpts::RGB_to_BGR1",  SkOpts::RGB_to_BGR1));
 DEF_BENCH(return new SwizzleBench("SkOpts::gray_to_RGB1", SkOpts::gray_to_RGB1));
+DEF_BENCH(return new SwizzleBench("SkOpts::grayA_to_RGBA", SkOpts::grayA_to_RGBA));
+DEF_BENCH(return new SwizzleBench("SkOpts::grayA_to_rgbA", SkOpts::grayA_to_rgbA));