On s390, no fpr/vrs are saved while resolving a symbol
via _dl_runtime_resolve/_dl_runtime_profile.

According to the abi, the fpr-arguments are defined as call clobbered.
In leaf-functions, gcc can use fprs for saving/restoring gprs
instead of saving them to the stack.
If gcc do this in one of the resolver-functions, then the floating point
arguments of a library-function are invalid for the first library-function-call.
The same could occur for vector registers. An ifunc-resolver
can also clobber the vector/floating point argument registers.

Furthermore, if _dl_runtime_profile calls _dl_call_pltexit,
the pointers to inregs-/outregs-structs are setup invalid.

On s390-32, an endless loop occurs if _dl_call_pltexit() should be called.