v3dv: lower frexp

Fixes:
dEQP-VK.glsl.builtin.precision.frexp.*

Part-of: <https://gitlab.freedesktop.org/mesa/mesa/-/merge_requests/6766>

src/broadcom/vulkan/v3dv_pipeline.c

@@ -359,6 +359,8 @@ preprocess_nir(nir_shader *nir,
               nir_var_mem_ubo | nir_var_mem_ssbo,
               nir_lower_direct_array_deref_of_vec_load);
 
+   NIR_PASS_V(nir, nir_lower_frexp);
+
    /* Get rid of split copies */
    nir_optimize(nir, stage, false);
 }