fold SkJumper_vectors.h into SkJumper_stages.cpp

This brings a little more symmetry to _stages.cpp and _stages_lowp.cpp.

Change-Id: Icfcbd3f264ab97d8445ad8e14c25b4a07c780aea
Reviewed-on: https://skia-review.googlesource.com/90030
Reviewed-by: Mike Klein <mtklein@chromium.org>
Commit-Queue: Mike Klein <mtklein@chromium.org>
3 files changed