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[Ada] Compiler crash with -gnatd.1 (force unnesting of subprograms)

From: Pierre-Marie de Rodat <derodat at adacore dot com>
To: gcc-patches at gcc dot gnu dot org
Cc: Ed Schonberg <schonberg at adacore dot com>
Date: Fri, 15 Dec 2017 05:21:50 -0500
Subject: [Ada] Compiler crash with -gnatd.1 (force unnesting of subprograms)
Authentication-results: sourceware.org; auth=none

This patch fixes a crash in the compiler when enabling unnesting of subprograms
on a generic unit.

The following must compile quietly:

gcc -c -gnatg -gnatd.1 a-btgbso.adb

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

2017-12-15  Ed Schonberg  <schonberg@adacore.com>

	* exp_unst.adb (Unnest_Subprograms): Nothing to do if the main unit is
	a generic package body. Unnesting is only an issue when generating
	code, and if the main unit is generic then nested instance bodies have
	not been created and analyzed, and unnesting will crash in the absence
	of those bodies,

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