[clang] clang: Emit llvm.loop.align metadata for -falign-loops (PR #223147)

[Eli Friedman via cfe-commits]

efriedma-quic wrote:

TailCallElim turns recursion into a loop.  Also, a "loop" written with goto isn't recognized by clang as a loop in the context of CGLoopInfo.

I can't think of anything else off the top of my head, though.

https://github.com/llvm/llvm-project/pull/223147