The "name" paramter for a Routine supports format strings with varargs,
but FunctionT did not correctly forward the args.

Bug: b/174358505
Change-Id: Ib94f8b8b4f8a4424e8aa0db0a4e4f8a286f3de2e
Reviewed-on: https://swiftshader-review.googlesource.com/c/SwiftShader/+/50788
Kokoro-Result: kokoro <noreply+kokoro@google.com>
Reviewed-by: Nicolas Capens <nicolascapens@google.com>
Tested-by: Antonio Maiorano <amaiorano@google.com>