PR26469 UBSAN: elflink.c:8742 shift exponent 6148914691236511722

PR26469 UBSAN: elflink.c:8742 shift exponent 6148914691236511722

	PR 26469
	* elflink.c: Include limits.h.
	(CHAR_BIT): Provide fallback define.
	(set_symbol_value): Correct complex reloc comment.
	(undefined_reference): Set bfd_error.
	(BINARY_OP_HEAD, BINARY_OP_TAIL): Split out from..
	(BINARY_OP): ..this.
	(eval_symbol): Limit shifts.  Force unsigned for left shift.
	Catch divide by zero.
	* configure.ac (AC_CHECK_HEADERS): Combine, sort and add limits.h.
	* configure: Regenerate.
	* config.in: Regenerate.