Minor tweak to df_note_bb_compute

Eric Botcazou ebotcazou@adacore.com
Thu Jun 9 21:51:00 GMT 2016

This simply prevents valgrind from complaining about an invalid read when 
pass_free_cfg::execute calls df_analyze for targets with delay slots, because 
var_location instructions are present in the RTL stream at this point.

Tested on x86_64-suse-linux, applied on the mainline as obvious.

2016-06-09  Eric Botcazou  <ebotcazou@adacore.com>

	* df-problems.c (df_note_bb_compute): Guard use of DF_INSN_INFO_GET.

Eric Botcazou
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