Since these are all already static, it doesn't have any real functional
impact in terms of linking or codegen. But it does supress unused
function warnings in compilation units that don't use everything.
Add a new SI boilerplate macro to go along with SINT and SIT.
Change-Id: If2c09951b7453338dd20a3a88e3abbee5eefcd27
Reviewed-on: https://skia-review.googlesource.com/c/195921
Commit-Queue: Mike Klein <mtklein@google.com>
Reviewed-by: Michael Ludwig <michaelludwig@google.com>
e9fc58663e