[Ada] Plug loophole in warn_on_field_placement

[Eric Botcazou]

Only the first component of a group of reordered bitfields was warned about.

Tested on x86-64/Linux, applied on mainline and 8 branch.


2018-06-12  Eric Botcazou  <ebotcazou@adacore.com>

	* gcc-interface/decl.c (warn_on_field_placement): Use specific wording
	for discriminants.
	(warn_on_list_placement): New static function.
	(components_to_record): Use it to warn on multiple fields in list.

-- 
Eric Botcazou
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