Fix IA-64 problems with denorms getting clobbered by type conversions.

PR libgcj/26483
* src/ia64/ffi.c (stf_spill, ldf_fill): Rewrite as macros.
(hfa_type_load): Call stf_spill.
(hfa_type_store): Call ldf_fill.
(ffi_call): Adjust calls to above routines.  Add local temps for
macro result.

From-SVN: r112900