[Ada] Wrong compile time evaluation of Shift_Right

Pierre-Marie de Rodat derodat@adacore.com
Fri Nov 27 09:18:01 GMT 2020

When using the Shift_Right operator on negative values (e.g. -1 on a
signed type), the wrong value is incorrectly folded after recent changes
in sem_eval.adb to add compile time evaluation of the shift operators.

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


	* sem_eval.adb (Fold_Shift): Fix evaluation of Shift_Right on
	negative values.
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