[Ada] Fix missing information in exception messages with -gnateE

[Eric Botcazou]

The information was missing in cases the front-end was able to turn the range 
comparison into a simple comparison.

Tested on x86-64/Linux, applied on the mainline.


2020-05-08  Eric Botcazou  <ebotcazou@adacore.com>

	* gcc-interface/trans.c (Raise_Error_to_gnu): Always compute a lower
	bound and an upper bound for use by the -gnateE switch for range and
	comparison operators.

-- 
Eric Botcazou
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