2015-10-16 Bob Duff <duff@adacore.com>

2015-10-16  Bob Duff  <duff@adacore.com>

	* a-contai.ads: Add two check names: Container_Checks and
	Tampering_Check.  Move the tampering check machinery from
	Ada.Containers.Vectors to Ada.Containers. Later we can share it
	with other containers.
	Disable the tampering machinery in the presence of
	Suppress(Tampering_Check).
	Simplify the implementation of tampering checks. E.g. use RAII
	to make incrementing/decrementing of the counts more concise.
	* a-contai.adb: New package body, implementing the above.
	* a-convec.ads, a-convec.adb: Use tampering check machinery
	in Ada.Containers.
	Disable all checking code when checks are suppressed.
	Simplify many of the operations. Implement "&" in terms of Append,
	rather than "by hand".
	Remove: function "=" (L, R : Elements_Array) return Boolean is
	abstract; so we can call the predefined "=" on Elements_Array.
	For "=" on Vectors: Previously, we returned True immediately if
	Left'Address = Right'Address.  That seems like a non-optimization
	("if X = X" is unusual), so removed that.  Simplify by using
	slice comparison ("=" on Element_Array will automatically call
	"=" on the components, even if user defined).

2015-10-16  Ed Schonberg  <schonberg@adacore.com>

	* sem_ch13.adb (Chek_Record_Representation_Clause): When
	iterating over components, skip anonymous subtypes created for
	constrained array components.

git-svn-id: svn+ssh://gcc.gnu.org/svn/gcc/trunk@228896 138bc75d-0d04-0410-961f-82ee72b054a4