replace 4f procs with pipeline (only called in 2 places by ganesh)

enables lots of code to delete

CQ_INCLUDE_TRYBOTS=skia.primary:Test-Ubuntu-GCC-GCE-CPU-AVX2-x86_64-Release-SKNX_NO_SIMD
Bug: skia:
Change-Id: I13631ead68a9232bd8c13c5ef54727f44def26ca
Reviewed-on: https://skia-review.googlesource.com/19278
Reviewed-by: Mike Klein <mtklein@google.com>
Commit-Queue: Mike Reed <reed@google.com>
9 files changed