utils.c (convert): When converting to the packable version of the type...

	ada/
	* gcc-interface/utils.c (convert) <CONSTRUCTOR case>: When converting
	to the packable version of the type, clear TREE_STATIC/TREE_CONSTANT
	on the result if at least one of the input fields couldn't be output
	as a static constant any more.

	testsuite/
	* gnat.dg/nested_float_packed.ads: New test.


Co-Authored-By: Eric Botcazou <ebotcazou@adacore.com>

From-SVN: r148049