NDS32/GAS: Correct an `expr' global shadowing error for pre-4.8 GCC
Remove `-Wshadow' compilation errors: cc1: warnings being treated as errors .../gas/config/tc-nds32.c: In function 'md_assemble': .../gas/config/tc-nds32.c:5212: error: declaration of 'expr' shadows a global declaration .../gas/expr.h:180: error: shadowed declaration is here make[4]: *** [tc-nds32.o] Error 1 which for versions of GCC before 4.8 prevent support for NDS32 targets from being built. See also GCC PR c/53066. gas/ * tc-nds32.c (md_assemble): Rename `expr' local variable to `insn_expr'.
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