Prevents you from mixing them up by mistake, and provides better self-documentation on function signatures.

Bug: b/126126820
Change-Id: I21ce20ded434ca3d5d03ebf3f9027cf6f6b5386f
Reviewed-on: https://swiftshader-review.googlesource.com/c/25068Reviewed-by: Nicolas Capens <nicolascapens@google.com>
Kokoro-Presubmit: kokoro <noreply+kokoro@google.com>
Tested-by: Ben Clayton <bclayton@google.com>