[Bug c++/81107] operator new(size_t) can't have hidden visibility

[thomasanderson at google dot com]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=81107

--- Comment #1 from Thomas Anderson <thomasanderson at google dot com> ---
Clang solved this recently by adding a -fvisibility-global-new-delete-hidden
option:
https://reviews.llvm.org/D53787