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[Ada] Suppress overlap code on assigning aggregate to var with address clause

From: Arnaud Charlet <charlet at adacore dot com>
To: gcc-patches at gcc dot gnu dot org
Cc: Gary Dismukes <dismukes at adacore dot com>
Date: Mon, 20 Apr 2009 14:30:53 +0200
Subject: [Ada] Suppress overlap code on assigning aggregate to var with address clause

On targets without the equivalent of memmove (such as for the AAMP target),
the recently added code for handling possible overlaps on array assignments
involving variables with address clauses unnecessarily takes effect when
the right-hand side is an aggregate. This treatment is now suppressed for
this case, generating code on AAMP that is similarly efficient to other
targets.

Tested on x86_64-pc-linux-gnu, committed on trunk

2009-04-20  Gary Dismukes  <dismukes@adacore.com>

	* exp_ch5.adb (Expand_Assign_Array): For the case where the assignment
	involves a target that has a specified address, don't set Forward_OK
	and Backward_OK to False if the rhs is an aggregate, since overlap
	can't occur.

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