Make single ctor for SkGlyph and remove reset

* Spruce up SkTLazy

Change-Id: Ice2b66009004a8d1894edd25790eca03ee451da2
Reviewed-on: https://skia-review.googlesource.com/c/183103
Commit-Queue: Herb Derby <herb@google.com>
Reviewed-by: Mike Klein <mtklein@google.com>
3 files changed