Anisotropic is not really supported in Eevee, but since code looks like
it is just intended to make it behave like glossy, it should function
like it too.
Seems like the internal calling from node_bsdf_glossy from
node_bsdf_anisotropic has swapped arguments.
Also: ssr_id is available for SH_NODE_BSDF_ANISOTROPIC as well (see
ntree_tag_bsdf_cb), so why not use it?