ARM Skia NEON patches - 03 - Duplicate code removal

src/core/SkBlitMask_D32.cpp

Index: src/core/SkBlitMask_D32.cpp
diff --git a/src/core/SkBlitMask_D32.cpp b/src/core/SkBlitMask_D32.cpp
index 80cc787991ed4431fff727ba6d98f900970c1799..1f16d775b51e2845a6ac5b08b272bd19c761bfeb 100644
--- a/src/core/SkBlitMask_D32.cpp
+++ b/src/core/SkBlitMask_D32.cpp
@@ -383,13 +383,9 @@ static int upscale31To255(int value) {
     return value;
 }
 
-static int mul(int a, int b) {
-    return a * b >> 8;
-}
-
 static int src_alpha_blend(int src, int dst, int srcA, int mask) {
 
-    return dst + mul(src - mul(srcA, dst), mask);
+    return dst + SkAlphaMul(src - SkAlphaMul(srcA, dst), mask);
 }
 
 static void LCD16_RowProc_Blend(SkPMColor* SK_RESTRICT dst,