Jonathan Wakely 41ccd683f0 libstdc++: Add std::atomic<shared_ptr>(nullptr_t) constructor (LWG 3661)
This DR was approved at the February 2022 plenary.

libstdc++-v3/ChangeLog:

	* include/bits/shared_ptr_atomic.h (atomic<shared_ptr>): Add
	constructor for constant initialization from nullptr_t.
	* testsuite/20_util/shared_ptr/atomic/atomic_shared_ptr.cc:
	Check for new constructor.
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..
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