[Ada] Remove repeated description of support for Address clauses

[Pierre-Marie de Rodat <derodat@adacore.com>]

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The GNAT behaviour regarding the Ada RM requirement to support Address
clauses for imported subprograms was documented twice: in section about
packed types (which was a mistake) and in section about address clauses
(where it belongs).

Cleanup related to the use of packed arrays for bitset operations to
detect uses of uninitialized scalars in GNAT.

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

gcc/ada/

	* doc/gnat_rm/implementation_advice.rst (Packed Types): Remove
	duplicated and wrongly placed paragraph.
	* gnat_rm.texi: Regenerate.

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diff --git a/gcc/ada/doc/gnat_rm/implementation_advice.rst b/gcc/ada/doc/gnat_rm/implementation_advice.rst
--- a/gcc/ada/doc/gnat_rm/implementation_advice.rst
+++ b/gcc/ada/doc/gnat_rm/implementation_advice.rst
@@ -353,12 +353,6 @@ then values of the type are implicitly initialized to zero. This
 happens both for objects of the packed type, and for objects that have a
 subcomponent of the packed type.
 
-
-  "An implementation should support Address clauses for imported
-  subprograms."
-
-Followed.
-
 .. index:: Address clauses
 
 RM 13.3(14-19): Address Clauses


diff --git a/gcc/ada/gnat_rm.texi b/gcc/ada/gnat_rm.texi
--- a/gcc/ada/gnat_rm.texi
+++ b/gcc/ada/gnat_rm.texi
@@ -14333,14 +14333,6 @@ then values of the type are implicitly initialized to zero. This
 happens both for objects of the packed type, and for objects that have a
 subcomponent of the packed type.
 
-@quotation
-
-“An implementation should support Address clauses for imported
-subprograms.”
-@end quotation
-
-Followed.
-
 @geindex Address clauses
 
 @node RM 13 3 14-19 Address Clauses,RM 13 3 29-35 Alignment Clauses,RM 13 2 6-8 Packed Types,Implementation Advice