glspirv: Call pass to lower frexp instructions

These were previously handled by the spirv_to_nir, but that changed to
be an explict pass in 23d30f4099 "spirv,nir: lower
frexp_exp/frexp_sig inside a new NIR pass"

Reviewed-by: Jason Ekstrand <jason@jlekstrand.net>

src/mesa/main/glspirv.c

@@ -262,6 +262,8 @@ _mesa_spirv_to_nir(struct gl_context *ctx,
    if (nir->info.stage == MESA_SHADER_VERTEX)
       nir_remap_dual_slot_attributes(nir, &linked_shader->Program->DualSlotInputs);
 
+   NIR_PASS_V(nir, nir_lower_frexp);
+
    return nir;
 }