[PATCH C++] document order of C++ ctors and attribute constructor is unspecified

[Martin Sebor]

In bug 52477 - Wrong initialization order?  attribute constructor
vs static data access, the reporter expects C++ objects with static
storage duration to have their ctors called in the same order as
those of functions declared with attribute constructor interleaved
with them.

In his comment on the bug Richard opines that relying on the order
is undefined.  The attached patch updates the manual to make this
clear.

Jason, can you please review it for 7.0?

Martin
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