ac/nir: fix 64-bit division for GL CTS
This fixes: KHR-GL45.gpu_shader_fp64.builtin.mod_*
Fixes: dfc0a5cc "ac/nir: use llvm.amdgcn.rcp in ac_build_fdiv()"
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This fixes: KHR-GL45.gpu_shader_fp64.builtin.mod_*
Fixes: dfc0a5cc "ac/nir: use llvm.amdgcn.rcp in ac_build_fdiv()"