[Ada] Lift old restriction on inlining

[Eric Botcazou]

This change lifts a restriction whereby calls to subprograms without a previous
spec declared in the same unit weren't subject to inter-unit inlining.  The
restriction is useless now thanks to the unit-at-a-time mode of the back-end.

Tested on i586-suse-linux, applied on the mainline.


2011-03-26  Eric Botcazou  <ebotcazou@adacore.com>

	* inline.adb (Back_End_Cannot_Inline): Lift restriction on calls to
	subprograms without a previous spec declared in the same unit.
	* gcc-interface/trans.c (Compilation_Unit_to_gnu): Process inlined
	subprograms at the end of the unit instead of at the beginning.
	* gcc-interface/utils.c (create_subprog_decl): Check that the entity
	isn't public for the special handling of non-inline functions nested
	inside inline external functions.


2011-03-26  Eric Botcazou  <ebotcazou@adacore.com>

	* gnat.dg/opt15.adb: New test.
	* gnat.dg/opt15_pkg.ad[sb]: New helper.


-- 
Eric Botcazou
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