skvm llvm skeleton

Just the basics of getting existing basic structure in place.
Hoping to flesh this out over the next week or so.

Change-Id: Iba3a3023cc779ffa5fa6f79ebedd53499c076442
Reviewed-on: https://skia-review.googlesource.com/c/skia/+/273323
Commit-Queue: Mike Klein <mtklein@google.com>
Reviewed-by: Herb Derby <herb@google.com>
1 file changed