libstdc++: Fix trivial relocation for constexpr std::vector

When implementing constexpr std::vector I added a check for constant
evaluation in vector::_S_use_relocate(), so that we would not try to relocate
trivial objects by using memmove. But I put it in the constexpr function
that decides whether to relocate or not, and calls to that function are
always constant evaluated. This had the effect of disabling relocation
entirely, even in non-constexpr vectors.

This removes the check in _S_use_relocate() and modifies the actual
relocation algorithm, __relocate_a_1, to use the non-trivial
implementation instead of memmove when called during constant
evaluation.

libstdc++-v3/ChangeLog:

	* include/bits/stl_uninitialized.h (__relocate_a_1): Do not use
	memmove during constant evaluation.
	* include/bits/stl_vector.h (vector::_S_use_relocate()): Do not
	check is_constant_evaluated in always-constexpr function.

0 files changed, 0 insertions, 0 deletions