[nios2, committed] allow constant offset with %gprel

[Sandra Loosemore]

I've checked in the attached patch to fix an oversight in the handling 
of GP-relative addressing modes in the nios2 back end.  It allows GCC to 
generate addresses of the form "%gprel(sym+offset)(gp)" instead of just 
"%gprel(sym)(gp)".  Formerly GCC required a scratch register and extra 
instruction to compute the address in this case, but in fact both the 
assembler and underlying relocation support a constant offset with %gprel.

-Sandra

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