4a0391c4a1
Shrinks the USDPrimReader base class by 24 bytes - Uses `StringRefNull` in place of a full `string` (prevents additional runtime allocations) - The `prim_path` field is only used sparingly, mostly for tracing, and a few non-perf-critical paths. No use keeping it around when it's easily, and quickly, accessible through other means. Pull Request: https://projects.blender.org/blender/blender/pulls/138232