* rtl.h (struct rtx_def): Update comments. (RTL_FLAG_CHECK[12345678]): New. (rtl_check_failed_flag): Declare. (RTL_FLAG): New. (CLEAR_RTX_FLAGS): New. (flag access macros): Use RTL_FLAG_CHECK macros with list of expected RTL codes. * rtl.c (copy_rtx, shallow_copy_rtx): Use RTX_FLAG macro. (rtl_check_failed_flag): New. * reload1.c (reload): Use REG macro before changing rtx to MEM. (reload_cse_noop_set_p): Check rtx code before using access macro. * config/ia64/ia64.c (process_for_unwind_directive): Check rtx code before using access macro. From-SVN: r53245
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