[clang] nonblocking/nonallocating attributes: 2nd pass caller/callee analysis (PR #99656)

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Sirraide wrote:

> Thanks. I started to do that and got distracted by a bunch of sections which aren't listed in the TOC :-/ Should I fix that while I'm there? (e.g. API Notes, Bounds Safety)

Er, not sure candidly. I’d leave those as-is for now and only add an entry for the function effects section.

CC @Endilll

https://github.com/llvm/llvm-project/pull/99656