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

[Timm Baeder via cfe-commits]

tbaederr wrote:

Quick comparison with the two benchmarks above:
<img width="1040" height="190" alt="Screenshot From 2026-03-09 17-10-44" src="https://github.com/user-attachments/assets/fc9da0ac-f9cc-409d-a6f7-cda7ba451d38" />


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