[Ada] Properly handle unprefixed references to components

[Pierre-Marie de Rodat]

In some cases, the compiler would incorrectly reject unprefixed uses of
component names in an aspect specification for the composite type.
Correct this error.

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

gcc/ada/

	* sem_ch13.adb (Replace_Type_Ref): In the case of an identifier
	that names a component of the type, simplify the test to decide
	whether to build a prefix for it (the prefix denotes the current
	instance of the enclosing type): if the identifier doesn't
	already have a prefix, then give it one. This isn't quite right
	in the corner case of a quantified expression or some other such
	expression that declares an object with the same name as a
	component, but it is still an improvement.
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