[libcxx] [modules] Add _LIBCPP_USING_IF_EXISTS on aligned_alloc (#89827)
This is missing e.g. on Windows. With this change, it's possible to make
the libcxx std module work on mingw-w64 (although that requires a few
fixes to those headers).
In the regular cstdlib header, we have _LIBCPP_USING_IF_EXISTS flagged
on every single reexported function (since
a9c9183ca42629fa83cdda297d1d30c7bc1d7c91), but the modules seem to only
have _LIBCPP_USING_IF_EXISTS set on a few individual functions, so far.
GitOrigin-RevId: 91526d64a8adb14edc55adfd5270858791822837
1 file changed
