[patch] Fix gnat.dg/aliasing2.adb regression

[Eric Botcazou]

> Sooo - can you check sth along the above instead?

OK, I acted boldly and tested the complete change. :-)  Bootstrapped/regtested 
and LTO-bootstrapped (for C/Ada) on x86_64-suse-linux, OK for mainline?


2010-11-29  Eric Botcazou  <ebotcazou@adacore.com>

	* tree.c (build_range_type_1): Do not SET_TYPE_STRUCTURAL_EQUALITY.
	(build_array_type_1): Do not consider TYPE_STRUCTURAL_EQUALITY_P and
	TYPE_CANONICAL for the index type.


-- 
Eric Botcazou
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