[clang] [clang][WebAssembly] Handle casted function pointers with different number of arguments (PR #153168)

[Derek Schuff via cfe-commits]

dschuff wrote:

Indeed, this is why I'm hoping we can make something explicit and targeted like a compiler builtin, rather than having to blindly transform the whole program.

https://github.com/llvm/llvm-project/pull/153168