lib2funcs.S (__xtensa_libgcc_window_spill, [...]): Use a syscall instructions to flush the register windows.


        * config/xtensa/lib2funcs.S (__xtensa_libgcc_window_spill,
        __xtensa_nonlocal_goto): Use a syscall instructions to flush
        the register windows.

From-SVN: r52503