[Ada] Missing propagation of Has_Predicates in cloned subtypes

[Pierre-Marie de Rodat]

The frontend silently skips propagating attributes Has_Predicates and
Predicate function to the internally built cloned subtype. This change
does not affect the functionality of the compiler; it leaves more clean
the decoration of internal entities.

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

2019-09-17  Javier Miranda  <miranda@adacore.com>

gcc/ada/

	* sem_ch3.adb (Complete_Private_Subtype): Propagate attributes
	Has_Attributes and Predicate_Function to the cloned subtype.
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