[Ada] Disable DECL_BIT_FIELD_REPRESENTATIVE machinery in some cases

[Eric Botcazou]

We can have quite convoluted layouts in Ada when a representation clause is 
given for a record type with variant part and this doesn't always play nice 
with the DECL_BIT_FIELD_REPRESENTATIVE machinery.  This patch arranges for 
DECL_BIT_FIELD_TYPE to be cleared on the variant part in these cases.

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


2018-11-08  Eric Botcazou  <ebotcazou@adacore.com>

	* gcc-interface/decl.c (components_to_record): Remove obsolete kludge.
	* gcc-interface/utils.c (make_packable_type): Set TYPE_PACKED on the
	new type but do not take into account the setting on the old type for
	the new fields.  Rename a local variable.
	(finish_record_type): Clear DECL_BIT_FIELD_TYPE on a variant part at
	offset 0, if any.
	(create_field_decl): Tweak comment.

-- 
Eric Botcazou
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