Revert of skrpb: evaluate color filters for constant shaders once.

src/opts/SkRasterPipeline_opts.h

Index: src/opts/SkRasterPipeline_opts.h
diff --git a/src/opts/SkRasterPipeline_opts.h b/src/opts/SkRasterPipeline_opts.h
index 97cd64a0be95470286181f6bded792e6cf275f83..cc308c0704fedfb27300593cd25c8448cf281c0a 100644
--- a/src/opts/SkRasterPipeline_opts.h
+++ b/src/opts/SkRasterPipeline_opts.h
@@ -25,9 +25,9 @@ namespace {
     static constexpr int N = 4;
 #endif
 
-    using SkNf = SkNx<N, float>;
-    using SkNi = SkNx<N, int>;
-    using SkNh = SkNx<N, uint16_t>;
+using SkNf = SkNx<N, float>;
+using SkNi = SkNx<N, int>;
+using SkNh = SkNx<N, uint16_t>;
 
     struct BodyStage;
     struct TailStage;
@@ -381,24 +381,6 @@ STAGE(store_f16, false) {
     }
 }
 
-STAGE(store_f32, false) {
-    auto ptr = *(SkPM4f**)ctx + x;
-
-    SkPM4f buf[8];
-    SkNf::Store4(kIsTail ? buf : ptr, r,g,b,a);
-    if (kIsTail) {
-        switch (tail & (N-1)) {
-            case 7: ptr[6] = buf[6];
-            case 6: ptr[5] = buf[5];
-            case 5: ptr[4] = buf[4];
-            case 4: ptr[3] = buf[3];
-            case 3: ptr[2] = buf[2];
-            case 2: ptr[1] = buf[1];
-        }
-        ptr[0] = buf[0];
-    }
-}
-
 
 // Load 8-bit SkPMColor-order sRGB.
 STAGE(load_d_srgb, true) {