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* fold-const.c (fold) <TRUNC_MOD_EXPR>: Optimize unsigned modulus by a power of two into a bit-wise AND, i.e. "X % C" as "X & (C-1)". Normalize "X % C" as "X % -C" for signed modulus and negative C. Optimize "X % -Y" as "X % Y" for signed modulus. <EQ_EXPR>: Recursively call "fold" when transforming "(X % Y) == 0" into "((unsigned) X % Y) == 0". From-SVN: r84122
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