Change code to not store Sk4* in data structures.

src/core/SkLinearBitmapPipeline.cpp

 /*
  * Copyright 2016 Google Inc.
  *
  * Use of this source code is governed by a BSD-style license that can be
  * found in the LICENSE file.
  */
 
 #include "SkLinearBitmapPipeline.h"
 
 #include <algorithm>
@@ skipping 579 matching lines @@
         newPixel = newPixel * fPostAlpha;
         newPixel.store(dst + index);
     }
     static Sk4f SK_VECTORCALL Premultiply(Sk4f pixel) {
         float alpha = pixel[3];
         return pixel * Sk4f{alpha, alpha, alpha, 1.0f};
     }
 
     SkPM4f* fDst;
     SkPM4f* fEnd;
-    Sk4f fPostAlpha;
+    float   fPostAlpha;
 };
 
 static SkLinearBitmapPipeline::BlendProcessorInterface* choose_blender_for_shading(
     SkAlphaType alphaType,
     float postAlpha,
     SkLinearBitmapPipeline::BlenderStage* blenderStage) {
     if (alphaType == kUnpremul_SkAlphaType) {
         blenderStage->initSink<SrcFPPixel<kUnpremul_SkAlphaType>>(postAlpha);
     } else {
         // kOpaque_SkAlphaType is treated the same as kPremul_SkAlphaType
@@ skipping 123 matching lines @@
 void SkLinearBitmapPipeline::blitSpan(int x, int y, void* dst, int count) {
     SkASSERT(count > 0);
     fLastStage->setDestination(dst, count);
 
     // The count and length arguments start out in a precise relation in order to keep the
     // math correct through the different stages. Count is the number of pixel to produce.
     // Since the code samples at pixel centers, length is the distance from the center of the
     // first pixel to the center of the last pixel. This implies that length is count-1.
     fFirstStage->pointSpan(Span{{x + 0.5f, y + 0.5f}, count - 1.0f, count});
 }