[Bug middle-end/87736] New attributes to mark custom alloc/free function pair

[msebor at gcc dot gnu.org]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=87736
Bug 87736 depends on bug 87731, which changed state.

Bug 87731 Summary: Detection of mismatched alloc/free pairs
https://gcc.gnu.org/bugzilla/show_bug.cgi?id=87731

           What    |Removed                     |Added
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             Status|ASSIGNED                    |RESOLVED
         Resolution|---                         |FIXED