i386.c: Include system.h.

i386.c: Include system.h.

        * i386.c: Include system.h.   Remove redundant includes.
        (optimization_options): Mark param 'size' with ATTRIBUTE_UNUSED.
        (i386_cc_probably_useless_p): Likewise for 'decl', 'attributes',
        'identifier', 'args'.
        (i386_valid_type_attribute_p): Likewise for 'attributes'.
        (i386_comp_type_attribute_p): Likewise for 'type1', 'type2'.
        (function_arg_partial_nregs): Likewise for 'cum', 'mode', 'type',
        and 'named'.
        (symbolic_operand): Likewise for 'mode'.
        (call_insn_operand): Likewise.
        (expander_call_insn_operand): Likewise.
        (ix86_logical_operator): Likewise.
        (ix86_binary_operator_ok): Likewise.
        (emit_pic_move): Likewise.
        (VOIDmode_compare_op): Likewise.
        (is_mul): Likewise.
        (str_immediate_operand): Likewise.
        (ix86_uary_operator_ok): Likewise for 'code', 'mode', and 'operands'.yy
        (asm_output_function_prefix): Likewise for 'name'.
        (function_prologue): Likewise for 'file', and 'size'.
        (function_epilogue): Likewise.

From-SVN: r20599