gcc/
	* df-scan.c (df_insn_info_init_fields): New function, split out
	from...
	(df_insn_create_insn_record): ...here.
	(df_insn_info_free_fields): New function, split out from...
	(df_insn_info_delete): ...here.
	(df_insn_rescan): Use the new functions instead of freeing and
	reallocating the df_insn_info.

From-SVN: r227139