Refactor implementation constants. Bug 19353282 Change-Id: If2eb9f2d78c3a44b720bb1f223711411b576d710 Reviewed-on: https://swiftshader-review.googlesource.com/5140 Reviewed-by: Alexis Hétu <sugoi@google.com> Tested-by: Nicolas Capens <capn@google.com> Reviewed-by: Nicolas Capens <capn@google.com>