[4.6] Fix PR tree-optimization/49725

[Eric Botcazou]

Hi,

this is the ICE at -O2 on ACATS c34005a introduced on the 4.6 branch by 
Martin's latest SRA patch.  But it's actually the same PRE issue as:
  http://gcc.gnu.org/ml/gcc-patches/2011-03/msg02210.html

Bootstrapped/regtested on i586-suse-linux, OK for 4.6 branch?


2011-07-14  Eric Botcazou  <ebotcazou@adacore.com>

	PR tree-optimization/49725
	Backport from mainline
	2011-03-31  Eric Botcazou  <ebotcazou@adacore.com>

	* tree-ssa-pre.c (create_component_ref_by_pieces_1) <ARRAY_REF>: Drop
	a zero minimum index only if it is redundant
	


-- 
Eric Botcazou
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