[Houdini] Provide support for adding in-memory stages to the GusdStageCache#775

Merged

pixar-oss merged 2 commits intoPixarAnimationStudios:devfrom sideeffects:dev_houdini_stagecache_anonymous

Mar 14, 2019

+56-3

Commits on Feb 25, 2019

Support invalidating the stage cache with in-memory stages that have
marktucker
committed
Provide an InsertStage method on the stage cache object to allow the
marktucker
committed