jumper, bilinear and bicubic sampling stages

This splits SkImageShaderContext into three parts:
   - SkJumper_GatherCtx: always, already done
   - SkJumper_SamplerCtx: when bilinear or bicubic
   - MiscCtx: other little bits (the matrix, paint color, tiling limits)

Thanks for the snazzy allocator that allows this Herb!

Both SkJumper and SkRasterPipeline_opts.h should be speaking all the
same types now.

I've copied the comments about bilinear/bicubic to SkJumper with little
typo fixes and clarifications.

Change-Id: I4ba7b7c02feba3f65f5292169a22c060e34933c6
Reviewed-on: https://skia-review.googlesource.com/13269
Reviewed-by: Herb Derby <herb@google.com>
Commit-Queue: Mike Klein <mtklein@chromium.org>

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