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ea18d5a4c2
Add the C23 memalignment function (query the alignment of a pointer) to glibc. Given how simple this operation is, it would make sense for compilers to inline calls to this function, but I'm treating that as a compiler matter (compilers should add it as a built-in function) rather than adding an inline version to glibc headers (although such an inline version would be reasonable as well). I've filed https://gcc.gnu.org/bugzilla/show_bug.cgi?id=122117 for this feature in GCC. Tested for x86_64 and x86.