with no more offline codegen, seed_shader can be normal

We passed this iota array as an argument before because it was
generating awkward code for our object file parser to handle
(relocations, other weird things, can't quite remember).

Now that we're compiling pipeline code normally, we can make seed_shader
a normal stage again, with no special iota ctx pointer needed.

Change-Id: I3929d61bfb6f914248f360c2c2326ce3d1f23163
Reviewed-on: https://skia-review.googlesource.com/113667
Reviewed-by: Herb Derby <herb@google.com>
Commit-Queue: Mike Klein <mtklein@chromium.org>
diff --git a/src/shaders/gradients/SkGradientShader.cpp b/src/shaders/gradients/SkGradientShader.cpp
index e5f0c7f..a6fb4e9 100644
--- a/src/shaders/gradients/SkGradientShader.cpp
+++ b/src/shaders/gradients/SkGradientShader.cpp
@@ -289,7 +289,7 @@
 
     SkRasterPipeline_<256> postPipeline;
 
-    p->append_seed_shader();
+    p->append(SkRasterPipeline::seed_shader);
     p->append_matrix(alloc, matrix);
     this->appendGradientStages(alloc, p, &postPipeline);