This benchmarks `sw::LRUCache`, which currently resides in the `src/Device` folder (but will be moved to `src/System`) with 43489.

Bug: b/153338950
Change-Id: I169b6ecb4a35349726a01b1da52472eaef3dfd74
Reviewed-on: https://swiftshader-review.googlesource.com/c/SwiftShader/+/43492Reviewed-by: Alexis Hétu <sugoi@google.com>
Reviewed-by: Antonio Maiorano <amaiorano@google.com>
Tested-by: Ben Clayton <bclayton@google.com>
Kokoro-Result: kokoro <noreply+kokoro@google.com>