small cleanups

  - get rid of variadic Assembler::byte()... not used very often
  - rename Assembler::byte(ptr,n) to bytes()
  - align with 0 bytes, get rid of nop()

Change-Id: I7564d3bad00e3f0d1c7a80153c445966914fccf0
Reviewed-on: https://skia-review.googlesource.com/c/skia/+/228601
Reviewed-by: Mike Klein <mtklein@google.com>
Commit-Queue: Mike Klein <mtklein@google.com>
3 files changed