libstdc++: Clear padding bits in std::atomic ctor in C++11 [PR114865]

After the front end change r16-7199 both GCC and Clang allow non-empty
constexpr constructor bodies in C++11 as an extension, so we can now
unconditionally enable the __builtin_clear_padding logic in std::atomic's
constructor.

	PR libstdc++/114865

libstdc++-v3/ChangeLog:

	* include/std/atomic (atomic<_Tp>::atomic(_Tp)) [C++11]:
	Enable __builtin_clear_padding logic.
	* testsuite/29_atomics/atomic/compare_exchange_padding.cc: Enable
	this test in earlier modes, including C++11.
	* testsuite/29_atomics/atomic/cons/zero_padding.cc [C++11]:
	Enable tests verifying cleared padding bits for a non-static-init
	std::atomic object.

Reviewed-by: Tomasz Kamiński <tkaminsk@redhat.com>
Reviewed-by: Jonathan Wakely <jwakely@redhat.com>

0 files changed, 0 insertions, 0 deletions