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* fold-const.c (omit_two_operands): New function. * tree.h (omit_two_operands): Prototype here. * builtins.c (fold_builtin_unordered_cmp): New function to lower C99 unordered comparison builtins to the appropriate tree nodes. (fold_builtin_1): Use fold_builtin_unordered_cmp to lower BUILT_IN_ISGREATER, BUILT_IN_ISGREATEREQUAL, BUILT_IN_ISLESS, BUILT_IN_ISLESSEQUAL and BUILT_IN_ISLESSGREATER. Manually lower BUILT_IN_ISUNORDERED comparisons to an UNORDERED_EXPR tree node. (simplify_builtin_memcmp, simplify_builtin_strncmp, simplify_builtin_strncat, simplify_builtin_strspn): Use the new omit_two_operands function to build the required COMPOUND_EXPRs. From-SVN: r83040
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