Nans for gll nodes

We observe nans for the recently implemented gll nodes as soon as we work with amr on supermucng. We start with a series of tests:

Basis	Mesh	AMR	Arch	Opt	MPI	Works
GLL	25	1	hsw	vect	No	yes
GLL	7	2	hsw	vect	No	yes
GL	25	1	skx	vect	Yes	yes
GLL	25	1	skx	vect	Yes	yes
GL	25	2	skx	vect	Yes	nans
GLL	25	2	skx	vect	Yes	nans
GL	25	2	skx	gen	Yes	nans
GLL	25	2	skx	gen	Yes	nans
GLL	79	1	skx	gen	Yes	yes
GLL	79	1	skx	gen	Yes	yes
GLL	239	1	skx	gen	Yes	yes

As GL as well as GLL nodes seem to fail repeat the GL 2 AMR level test on the master branch:

Basis	Mesh	AMR	Arch	Opt	MPI	ExaSeis	Works
GL	25	2	skx	gen	Yes	master	nans

Which shows the same behaviour for default old cases.