MeshCollider.Raycast causes a crash, when called by a non-convex mesh collider with a dynamic rigidbody.

To reproduce:
1. Open repro2.unitypackage
2. Open scene repro. It contains a directional light with a mesh collider and a rigidbody. There is also a script attach that calls a raycast from the mesh collider on start
3. Enter play mode
4. Unity crashes

Though non-convex meshes + dynamic rigidbodies are not supported, unity should not crash.

Regression since 5.0.0a16