Use template specialization to handle the static control flow based
on template parameters during code generation instead of relying
on the optimizer to remove the unused code path.
v2: - Fix function opening brace location (zmike)
- remove accidently added dead code
Signed-off-by: Gert Wollny <gert.wollny@collabora.com>
Part-of: <https://gitlab.freedesktop.org/mesa/mesa/-/merge_requests/27327>
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