[clang] [lld] [llvm] [LLVM][WebAssembly] Implement branch hinting proposal (PR #146230)

[Lukas Döllerer via llvm-commits]

Lukasdoe wrote:

Changes:
- Added branch hinting section parser to wasm2yaml
- Threshold setting parameters are now floats
- Fixed all other things aengelke found

https://github.com/llvm/llvm-project/pull/146230