Remove templates from GrTextBlobVertexRegenerator

This was originally done for performance, but I'd like to see if
there's a measurable regression here.

I think the new code is much simpler, and easier to maintain. It's also
going to be easier to retrofit with wide color.

This appears to save about 3.5 KB of code size.

Bug: skia:
Change-Id: I71297c356c34a13b239d4247b722a59b7c61fbb2
Reviewed-on: https://skia-review.googlesource.com/c/182146
Reviewed-by: Herb Derby <herb@google.com>
Commit-Queue: Brian Osman <brianosman@google.com>
2 files changed