move load_and_inc() and LazyCtx into SkJumper_misc.h

This is a no-op refator that'll help keep the interesting diff more
focused in the lowp CL.  The lowp stages will use these unaltered, so
SkJumper_misc.h is a good place for them.

Change-Id: I7fb6327ade29ac884194517d94ac4303ed1079e0
Reviewed-on: https://skia-review.googlesource.com/18484
Reviewed-by: Mike Klein <mtklein@chromium.org>
Reviewed-by: Herb Derby <herb@google.com>
Commit-Queue: Mike Klein <mtklein@chromium.org>
2 files changed