[llvm] [WebAssembly] Limit increase of Ctx.End (PR #76676)

[via llvm-commits]

DavidKorczynski wrote:

I added the trigger file and adjusted the `sizeof` in the unit test.

I likely won't have cycles to reduce it even further or similar just because I know little of the LLVM code -- I'm coming from the fuzz world and know my way around e.g. https://github.com/google/oss-fuzz , but am not well-versed in the details of LLVMs codebase.

Am happy to monitor the LLVM's OSS-Fuzz set up to ensure it's running proper and submit fixes for the issues (which happens in various parts of the codebase) I can handle (i.e. with the limited knowledge of the codebase), but I don't have cycles to go much further than that unfortunately.

https://github.com/llvm/llvm-project/pull/76676