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

[Timm Baeder via cfe-commits]

tbaederr wrote:

> he 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

And how could that possibly be prevented if MSVC doesn't do `[[musttail]]` in debug builds?

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