[Ada] Fix wrong size computation with boolean discriminant

[Eric Botcazou]

This is a regression present on the mainline and caused by the wrong handling 
of TRUTH_NOT_EXPR by the max_size function.

Tested on x86_64-suse-linux, applied on the mainline.


2017-02-24  Eric Botcazou  <ebotcazou@adacore.com>

	* gcc-interface/utils.c (max_size) <tcc_expression>: Flip the second
	argument when recursing on TRUTH_NOT_EXPR.


2017-02-24  Eric Botcazou  <ebotcazou@adacore.com>

	* gnat.dg/discr47.adb: New test.

-- 
Eric Botcazou
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