trans.h (gfc_build_compare_string): Add CODE argument.

trans.h (gfc_build_compare_string): Add CODE argument.

	* trans.h (gfc_build_compare_string): Add CODE argument.
	* trans-intrinsic.c (gfc_conv_intrinsic_strcmp): Pass OP to
	gfc_build_compare_string.
	* trans-expr.c (gfc_conv_expr_op): Pass CODE to
	gfc_build_compare_string.
	(string_to_single_character): Rename len variable to length.
	(gfc_optimize_len_trim): New function.
	(gfc_build_compare_string): Add CODE argument.  If it is EQ_EXPR
	or NE_EXPR and one of the strings is string literal with LEN_TRIM
	bigger than the length of the other string, they compare unequal.

From-SVN: r162208