[patch] Preserve return statements at -O0

[Eric Botcazou]

Hi,

this patchlet ensures that return statements are preserved at -O0 so that you 
can put a breakpoint on them in the debugger.

Bootstrapped/regtested on x86_64-suse-linux, OK for the mainline?


2011-04-06  Eric Botcazou  <ebotcazou@adacore.com>

	* gimple-low.c (lower_gimple_return): When not optimizing, force
	labels associated with user returns to be preserved.


2011-04-06  Eric Botcazou  <ebotcazou@adacore.com>

	* gnat.dg/return3.adb: New test.


-- 
Eric Botcazou
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