[Bug libstdc++/105995] QoI: constexpr basic_string variable must use all of its SSO buffer

[de34 at live dot cn]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=105995

--- Comment #2 from Jiang An <de34 at live dot cn> ---
(In reply to Andrew Pinski from comment #1)
> C++20 supports dynamic allocation for constexpr.

Yeah, but a constexpr variable can't hold dynamically allocated memory.
Dynamically allocated memory must be deallocated within its initialization.