[Ada] Missing accessibility error on object in type conversion

[Pierre-Marie de Rodat]

This patch corrects an issue whereby the compiler would incorrectly
calculate accessibility levels of objects within type conversions -
leading to potentially missing static and dynamic errors.

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

2020-06-11  Justin Squirek  <squirek@adacore.com>

gcc/ada/

	* sem_util.adb (Expand_N_Attribute_Reference): Use original
	nodes where required to avoid looking at the expanded tree.
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