It took me quite a while to figure out what this class was doing.

Change-Id: I97ab2576e309ee6ca69dd741fd47a86d8cdc6313
Reviewed-on: https://swiftshader-review.googlesource.com/c/SwiftShader/+/25248
Presubmit-Ready: Ben Clayton <bclayton@google.com>
Kokoro-Presubmit: kokoro <noreply+kokoro@google.com>
Tested-by: Ben Clayton <bclayton@google.com>
Reviewed-by: Nicolas Capens <nicolascapens@google.com>