[Ada] Clean up in handling of -gnatdA

[Arnaud Charlet <charlet at adacore dot com>]

Tested on x86-linux, committed on mainline.

Previously, if debug flag A was set, then in Repinfo, -gnatR3m mode was
set, but in some cases this is too late. For example, a compiler crash
could occur if switches -gnatdA and -gnatc were used without -gnatR. This
minor change cleans things up so that -gnatR3m mode is set at the start of
execution of the compiler, eliminating these anomolies.

2004-12-07  Robert Dewar  <dewar@adacore.com>

	* debug.adb: Document that -gnatdA automatically sets -gnatR3m

	* gnat1drv.adb (Gnat1drv): If debug flag A set, then automatically
	set -gnatR3m mode.

	* repinfo.adb (List_Rep_Info): Remove special handling of -gnatdA
	flag. No longer needed now that we handle this in gnat1drv.adb.

	* repinfo.ads: Minor reformatting

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