nir/lower_int64: lower 64-bit amul
Fixes an issue with RenderDoc's shader debugging with ACO.
If nir_opt_algebraic isn't called in-between nir_lower_explicit_io and nir_lower_int64, we can end up with 64-bit multiplications.
Fixes an issue with RenderDoc's shader debugging with ACO.
If nir_opt_algebraic isn't called in-between nir_lower_explicit_io and nir_lower_int64, we can end up with 64-bit multiplications.