[clang] [clang][bytecode] Use tailcalls via `[[clang::musttail]]` (PR #173756)

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Sirraide wrote:

> Looking at the build output of the builds in the compile-time-tracker, it doesn't seem like using the musttail attribute does much

In release mode I’d optimise every sensible compiler to optimise this regardless; the main thing I’m concerned about is that we might start getting stack overflows in debug mode if we don’t force a tail call here

https://github.com/llvm/llvm-project/pull/173756