[Ada] Remove Unknown_ functions

[Pierre-Marie de Rodat]

Remove the Unknown_ type representation attribute predicates from
Einfo.Utils. "not Known_Alignment (...)" is at least as readable as
"Unknown_Alignment (...)" -- we don't need a bunch of functions that
just do a "not".

Tested on x86_64-pc-linux-gnu, committed on trunk

gcc/ada/

	* einfo-utils.ads, einfo-utils.adb (Unknown_Alignment,
	Unknown_Component_Bit_Offset, Unknown_Component_Size,
	Unknown_Esize, Unknown_Normalized_First_Bit,
	Unknown_Normalized_Position, Unknown_Normalized_Position_Max,
	Unknown_RM_Size): Remove these functions.
	* exp_pakd.adb, exp_util.adb, fe.h, freeze.adb, layout.adb,
	repinfo.adb, sem_ch13.adb, sem_ch3.adb, sem_util.adb: Remove
	calls to these functions; do "not Known_..." instead.
	* gcc-interface/decl.c, gcc-interface/trans.c
	(Unknown_Alignment, Unknown_Component_Size, Unknown_Esize,
	Unknown_RM_Size): Remove calls to these functions; do
	"!Known_..." instead.
-------------- next part --------------
A non-text attachment was scrubbed...
Name: patch.diff
Type: text/x-diff
Size: 21676 bytes
Desc: not available
URL: <https://gcc.gnu.org/pipermail/gcc-patches/attachments/20210708/14b3e947/attachment-0001.bin>