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asahi,agx: Upload constant buffers immediately

Janne Grunau requested to merge jannau/mesa:fix_uaf_in_constant_buffer_upload into main

The lifetime of the constant buffer's user_buffer is not guaranteed to last until agx_upload_uniforms.
Fixes the same ASAN issue mesa/mesa!21685 is trying to address.

@alyssa might address this issue in mesa common code. That would supersede this merge request and potentially fixes the same issue in other drivers.

Fixes: 080b05e2 ("asahi: Add Gallium driver")
Signed-off-by: Janne Grunau j@jannau.net

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