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all userland dies with SIGSEGV on LOONGSON (Lemote YEELOONG)

Now that evbmips64-el builds again for LOONGSON processors, I set about
doing just that.

The result is that all userland programs die with SIGSEGV, usually upon
exit (they otherwise seem to work OK).

Examining results with 'gdb' produces similar results in all examples

Core was generated by '<progname>'.
Program terminated with signal 11, Segmentation fault.
#0  0x00000000 in ?? ()
(gdb) bt
#0  0x00000000 in ?? ()
#1  0xqqqqqqqq in _ftext ()
#2  0xrrrrrrrr in ?? ()
warning: GDB can't find the start of the function at 0xssssssss.

where "0xssssssss" is exactly 2 less than "0xrrrrrrrr".

Upon exit, 'gdb' itself incurs SIGSEGV.

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