6848e05f9c
For AMD GPU which has instruction to normalize and pack two float16 inputs, and used when fragment shader export color output. Reviewed-by: Marek Olšák <marek.olsak@amd.com> Signed-off-by: Qiang Yu <yuq825@gmail.com> Part-of: <https://gitlab.freedesktop.org/mesa/mesa/-/merge_requests/21552>