[llvm] [Support] Add decodeULEB128AndInc/decodeSLEB128AndInc (PR #85739)

[Adrian Prantl via llvm-commits]

adrian-prantl wrote:

I was _assuming_ that the code that uses these functions does a bounds safety check for the entire section. @MaskRay ?

https://github.com/llvm/llvm-project/pull/85739