[Ada] ACATS 4.1J - B854003 - Subtype conformance check missed

[Pierre-Marie de Rodat]

This test shows that GNAT was missing formal subprogram conformance
checking in some cases, now fixed.

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

2020-06-18  Arnaud Charlet  <charlet@adacore.com>

gcc/ada/

	* sem_ch6.ads, sem_ch6.adb (Check_Formal_Conformance): New
	subprogram.
	(Check_Conformance): Move code to Check_Formal_Conformance.
	* sem_ch8.adb (Analyze_Subprogram_Renaming): Check for formal
	conformance when needed.
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