Use NEON optimizations for RGB -> RGB(FF) or BGR(FF) in SkSwizzler

bench/SwizzleBench.cpp

Index: bench/SwizzleBench.cpp
diff --git a/bench/SwizzleBench.cpp b/bench/SwizzleBench.cpp
index 13b2003f9a8b10b253020746762f602c84e77588..9ecc1506a1ccc8d92097d0682766aa47ed84b170 100644
--- a/bench/SwizzleBench.cpp
+++ b/bench/SwizzleBench.cpp
@@ -30,3 +30,5 @@ private:
 DEF_BENCH(return new SwizzleBench("SkOpts::premul_xxxa", SkOpts::premul_xxxa));
 DEF_BENCH(return new SwizzleBench("SkOpts::swaprb_xxxa", SkOpts::swaprb_xxxa));
 DEF_BENCH(return new SwizzleBench("SkOpts::premul_swaprb_xxxa", SkOpts::premul_swaprb_xxxa));
+DEF_BENCH(return new SwizzleBench("SkOpts::xxx_xxxa", SkOpts::xxx_xxxa));
+DEF_BENCH(return new SwizzleBench("SkOpts::xxx_swaprb_xxxa", SkOpts::xxx_swaprb_xxxa));