Optimize CMYK->RGBA (BGRA) transform for jpeg decodes

bench/SwizzleBench.cpp

Index: bench/SwizzleBench.cpp
diff --git a/bench/SwizzleBench.cpp b/bench/SwizzleBench.cpp
index cf7a407f0e136b68e0a05c44276ca0eb14060a14..73a0584494041a772ad4f879e91620efc7679e03 100644
--- a/bench/SwizzleBench.cpp
+++ b/bench/SwizzleBench.cpp
@@ -35,3 +35,5 @@ 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));
+DEF_BENCH(return new SwizzleBench("SkOpts::CMYK_to_RGB1", SkOpts::CMYK_to_RGB1));
+DEF_BENCH(return new SwizzleBench("SkOpts::CMYK_to_BGR1", SkOpts::CMYK_to_BGR1));